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Old 02-21-2010, 09:46 PM   #1
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Default PSL Build Help

I need some help diagnosing what's wrong with my PSL build.

I picked up the PSL kit (very, very good) and Romanian receiver (atrocious) from Tennessee Guns during a recent sale.

At this point I've got it almost functioning, but I'm running into a few problems.

The bolt and carrier will move in the rails... finally... but still seem to hang up about halfway through the cycle. A simple hand whack will free it and it will go into battery just fine. Headspace is fine. Unfortunately this means I don't have a semi-auto PSL at this point. It seems to extract and eject okay, but even when fired hangs up halfway through it's normal traverse.

Do I need to do more work on the primary rails? Is this potentially a problem with the bolt rails? Other thoughts? It seems to have the same behavior with and without a magazine, so I don't think the mag has anything to do with it.
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Old 02-21-2010, 10:04 PM   #2
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Do you have the problem with the carrier by itself[bolt removed]?
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Old 02-21-2010, 10:24 PM   #3
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Quote:
Originally Posted by a-kmanator
Do you have the problem with the carrier by itself[bolt removed]?
I don't believe so... it seemed to travel okay without the bolt...
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Old 02-21-2010, 10:28 PM   #4
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Then the bolt is hanging up on the ejector...try to carefully pry the receiver open more and see if that helps.
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Old 02-21-2010, 10:30 PM   #5
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Quote:
Originally Posted by a-kmanator
Then the bolts hanging up on the ejector...try to carefully pry the receiver open more and see if that helps.
Makes sense... I thought it may be something like that... Thanks!
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Old 02-22-2010, 07:21 AM   #6
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Take Sharpie and black the ejector to see if makes contact...any heavy contact will take it right off...

My first thought was the bolt/carrier hanging on the hammer!?!?!?
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Old 02-22-2010, 11:07 AM   #7
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Quote:
Originally Posted by CaptnC
Take Sharpie and black the ejector to see if makes contact...any heavy contact will take it right off...

My first thought was the bolt/carrier hanging on the hammer!?!?!?
That's a possibility as well - the hammer does seem to be riding a bit higher than most I've use - I may try dropping a different FCG in there and see if that helps.
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Old 02-22-2010, 11:51 AM   #8
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If you are going to swap FCG's. Be sure to try cyclig the rifle without the FCG in place to either identify that as the issue or to then be able to zero in on the rails and/or ejector for the problem.
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Old 02-22-2010, 12:01 PM   #9
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Quote:
Originally Posted by AKBLUE
If you are going to swap FCG's. Be sure to try cyclig the rifle without the FCG in place to either identify that as the issue or to then be able to zero in on the rails and/or ejector for the problem.
+1...I had to reshape many hammers on my builds.
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Old 02-22-2010, 12:27 PM   #10
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Quote:
Originally Posted by AKBLUE
If you are going to swap FCG's. Be sure to try cyclig the rifle without the FCG in place to either identify that as the issue or to then be able to zero in on the rails and/or ejector for the problem.
Will do...

One thing I do know, if you have the bolt carrier, but not the bolt, in place, the hammer WILL stop the bolt carrier...
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Old 02-22-2010, 07:03 PM   #11
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Hello there:
When I built my PSL the same thing happened. The cure for me was to cut the heel off an old tennis shoe and wedge it in the back of the receiver. Problem solved.

It seemed that the bolt carrier was riding back too far and hanging up on the hammer, with the "sole buffer" in place, the carrier can't go that far back and so the rifle cycles as it should! Give it a try, it's E-Zer than messing with the receiver.
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Old 02-22-2010, 07:45 PM   #12
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Im also betting that you are hanging up on the hammer. There is significant drag when you go over it. Try cycling it at full speed with the return spring installed. Should feel a bit different.

BTW, if you decide to replace the FCG, Red Star ARms sells a 2 stage trigger that is %1000 better than stock. It makes a world of difference and is WELL worth the money.
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Old 02-22-2010, 08:40 PM   #13
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Quote:
Originally Posted by ScottD.
Im also betting that you are hanging up on the hammer. There is significant drag when you go over it. Try cycling it at full speed with the return spring installed. Should feel a bit different.

BTW, if you decide to replace the FCG, Red Star ARms sells a 2 stage trigger that is %1000 better than stock. It makes a world of difference and is WELL worth the money.
I've got one of those I'm going to use for my Tabuk - which is almost done... again... I hope...

May end up picking up a couple more. I've got an M76 kit coming in too...
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Old 02-22-2010, 08:45 PM   #14
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try cycling it and hold the trigger back so the disconnector doesn't reset. This will hold the hammer down and reduce the spring presure on the bottom of the bolt carrier. I've also found that a bit of lube on the bottom of the carrier where the hammer slides over will also help diagnose this.
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Old 02-22-2010, 10:31 PM   #15
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Quote:
Originally Posted by Bubbajj
try cycling it and hold the trigger back so the disconnector doesn't reset. This will hold the hammer down and reduce the spring presure on the bottom of the bolt carrier. I've also found that a bit of lube on the bottom of the carrier where the hammer slides over will also help diagnose this.
I didn't get a chance to take it apart tonight, but I'm 90% convinced it's the FCG. The hammer only contacts the hook of the trigger - it's not interacting with the disconnector at all...
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Old 02-23-2010, 07:19 AM   #16
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Quote:
Originally Posted by fingolfen
I didn't get a chance to take it apart tonight, but I'm 90% convinced it's the FCG. The hammer only contacts the hook of the trigger - it's not interacting with the disconnector at all...
What Bubba is saying...is the disconnector holds the hammer lower than the trigger hook does...if the hammer is the problem holding the hammer with the disconnector should let the carrier ride though its stroke with less interference.


The Tantal I built a month or so ago on a AKM receiver with AKM FCG the carrier hit the hammer hard and I ground some off the hammer and she runs like a clock now!
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Old 02-23-2010, 11:03 AM   #17
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Quote:
Originally Posted by CaptnC
What Bubba is saying...is the disconnector holds the hammer lower than the trigger hook does...if the hammer is the problem holding the hammer with the disconnector should let the carrier ride though its stroke with less interference.


The Tantal I built a month or so ago on a AKM receiver with AKM FCG the carrier hit the hammer hard and I ground some off the hammer and she runs like a clock now!
That's the problem - I can't get the disconnector to hold the hamer at all... it may as well not even be there...
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Old 02-23-2010, 12:16 PM   #18
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Quote:
Originally Posted by fingolfen
That's the problem - I can't get the disconnector to hold the hamer at all... it may as well not even be there...

OH NO!

Sounds like you've got either a mis-matched FCG or the axis pin holes are too are apart...your hammer must be following the carrier back to battery too?!?!?!

You did remember to put the spring under the disconnector...right?
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Old 02-23-2010, 12:37 PM   #19
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Quote:
Originally Posted by CaptnC
OH NO!

Sounds like you've got either a mis-matched FCG or the axis pin holes are too are apart...your hammer must be following the carrier back to battery too?!?!?!

You did remember to put the spring under the disconnector...right?
No, the hammer doesn't follow all the way back to battery, the trigger hook catches it.

The spring is indeed in the disconnector...

I'm going to try another FCG to see if it works better - if not, it looks like I'm going to have to bust my parts out of this POS receiver and start over...
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Old 02-23-2010, 12:38 PM   #20
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Or is the hammer facing the right direction?
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Old 02-23-2010, 12:46 PM   #21
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Quote:
Originally Posted by a-kmanator
Or is the hammer facing the right direction?
It is...
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Old 02-23-2010, 02:46 PM   #22
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I've built eight PSL's. Almost all of them had this issue, which typically has more than one cause. I've found that "hammer hang" is almost always a problem, especially with the G2 FCG. In addition, I usually have to grind, polish and otherwise tweak the top rails.

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Old 02-23-2010, 02:49 PM   #23
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BTW, you'll want to remove the FCG until your sure you're sure the top rails are OK.

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Old 02-23-2010, 03:02 PM   #24
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If the disconnector isn't grabbing the hammer as the trigger is pulled and the carrier reaches it's maximum rearward travel something is seriously wrong. What reciever did you use? The trigger shouldn't grab anything if you are still holding it back through the cycle. If it is, the hammer should have never dropped in the first place. I used the Centerfire Romanian reciever on my build with the G2 trigger group and had no problems. Seriously, if it's doing what your describing, it's seriously F'ed up.

Make sure it's unloaded. Pull the trigger DO NOT RELEASE IT!!. Cycle the carrier WITH THE TRIGGER STILL PULLED BACK!! As the carrier moves over the hammer, the disconnector should grab the hammer and hold it down. When you release the trigger you should hear a click as the hammer is released by the disconnector and it pops up onto the trigger hook/hooks. This is a basic function check. The trigger hook cannot be grabbing the hammer if the trigger is being held back. IF it is you've got some 5th dimentional stuff going on. The hammer cant drop in the first place if the hooks grab the hammer. Most likely the disconnector spring is missing.

Bolt hang up on a new build 8 out of 10 times is simply the new reicever and new trigger group needing a bit of break in time. A bit of lube and a bit of firing should eliminate the problem. It usually doesn't effect funtion if you let the bolt run home like your supposed to on the first round chambers. It rarely effects the function of the gun whilst fireing as your holding the trigger and reducing the effect of the bolt riding on the hammer. I've build close to thirty of em all with G2 triggers on all sorts of recievers and never had a problem with this. Either I'm living right or people are putting too much emphasis on bolt hang up on a brand new build. If it's doing what your saying it's doing, take it to someone who knows what they are doing before you blow yourself up with an out of battery detonation.

I have had problems with PSLs not chamber fully because of crappy mags. Check it with several mags so see if this is the case.
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Old 02-23-2010, 03:28 PM   #25
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Quote:
Originally Posted by Bubbajj
If the disconnector isn't grabbing the hammer as the trigger is pulled and the carrier reaches it's maximum rearward travel something is seriously wrong. What reciever did you use? The trigger shouldn't grab anything if you are still holding it back through the cycle. If it is, the hammer should have never dropped in the first place. I used the Centerfire Romanian reciever on my build with the G2 trigger group and had no problems. Seriously, if it's doing what your describing, it's seriously F'ed up.

Make sure it's unloaded. Pull the trigger DO NOT RELEASE IT!!. Cycle the carrier WITH THE TRIGGER STILL PULLED BACK!! As the carrier moves over the hammer, the disconnector should grab the hammer and hold it down. When you release the trigger you should hear a click as the hammer is released by the disconnector and it pops up onto the trigger hook/hooks. This is a basic function check. The trigger hook cannot be grabbing the hammer if the trigger is being held back. IF it is you've got some 5th dimentional stuff going on. The hammer cant drop in the first place if the hooks grab the hammer. Most likely the disconnector spring is missing.

Bolt hang up on a new build 8 out of 10 times is simply the new reicever and new trigger group needing a bit of break in time. A bit of lube and a bit of firing should eliminate the problem. It usually doesn't effect funtion if you let the bolt run home like your supposed to on the first round chambers. It rarely effects the function of the gun whilst fireing as your holding the trigger and reducing the effect of the bolt riding on the hammer. I've build close to thirty of em all with G2 triggers on all sorts of recievers and never had a problem with this. Either I'm living right or people are putting too much emphasis on bolt hang up on a brand new build. If it's doing what your saying it's doing, take it to someone who knows what they are doing before you blow yourself up with an out of battery detonation.

I have had problems with PSLs not chamber fully because of crappy mags. Check it with several mags so see if this is the case.
I'll give it the full once over this evening. I'm using the Romanian receiver. Initially I couldn't even get the bolt carrier into this receiver because the rails were too thick. I've had that happen on a few other builds where I've used anything other than a NoDak receiver, so I wasn't too worried - but everytime I seem to get past one problem on this receiver, I find two more...

Once I get the carrier to move, it will go into battery just fine - the bolt locks in the lugs nicely, it just hangs after every fire.
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Old 02-23-2010, 03:43 PM   #26
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be careful about cutting on the reciever. The PSL bolts are a bit harder to get in. If you mess with it too much you'll get the bolt to jump out of the rails on the back stroke. Also check several mags. I have one PSL mag that simple will not allow the gun to cycle. It runs fine with other mags. Try chambering a round and then removing the mag before fireing. See how it cycles without a mag in it.
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Old 02-23-2010, 04:09 PM   #27
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Quote:
Originally Posted by fingolfen
I'm using the Romanian receiver. Initially I couldn't even get the bolt carrier into this receiver because the rails were too thick.
I've experianced this on like 5 out of my eight PSL builds. However, as Bubbajj mentions, you need to be really careful when "tweaking" the top rails. At this point I have a pretty good feel for it, but YMMV.

That being said, remove the hammer and ensure your bolt carrier cycles freely with the recoil spring installed. Then re-install the hammer and do a basic function check on the FCG. Only then are you ready to address any "hammer drag" issues, provided you even still have any.

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Old 02-23-2010, 11:05 PM   #28
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Update: I had time to do a fair amount of work on the beast tonight...

Here's what I've found so far.

No FCG - bolt and carrier cycle just fine with the recoil spring in place - no hangups.

FCG - with the trigger all the way back, the hammer will indeed be captured just fine by the disconnector.

Hammer needed major work, however, as it would effectively lock the bolt and carrier back if it wasn't held by the disconnector. I used a U.S. hammer as a guide and reshaped it. Now the thing doesn't lock up anymore.

Unfortunately I still get a little hang every time I cycle it at this point with the FCG installed. A light tap will clear it, but I do have to tap it every time. I haven't had a chance to try it with a few rounds as it's dark and rainy here...

Thoughts?
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Old 02-23-2010, 11:15 PM   #29
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Hey, Mike

I’d like to take a look at it. I’ve carved on a few FCG. I might be talked into taking a drive out your way on Saturday if you’re interested.



Elk...
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Old 02-23-2010, 11:17 PM   #30
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Quote:
Originally Posted by Elkaholic
Hey, Mike

I’d like to take a look at it. I’ve carved on a few FCG. I might be talked into taking a drive out your way on Saturday if you’re interested.



Elk...
How's it going???

I think I'm going to be in town on Saturday - what time you going to be in the neighborhood?
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Old 02-23-2010, 11:22 PM   #31
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Quote:
Originally Posted by fingolfen
How's it going???

I think I'm going to be in town on Saturday - what time you going to be in the neighborhood?
I would like to talk to a guy out there but I’m not sure if he’ll be around. I don’t really have anything going on so whenever is good for you.
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Old 02-23-2010, 11:25 PM   #32
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Quote:
Originally Posted by fingolfen
I still get a little hang every time I cycle it at this point with the FCG installed. A light tap will clear it, but I do have to tap it every time.
If you reshaped the hammer, make sure it still hits the firing pin squarely. I can get most of my AK-style rifles to "hammer hang" if I "feather" the bolt carrier when cycling by hand. However, they all cycle reliably when fired . . . YMMV.

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Old 02-23-2010, 11:29 PM   #33
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Quote:
Originally Posted by LESchwartz
If you reshaped the hammer, make sure it still hits the firing pin squarely. I can get most of my AK-style rifles to "hammer hang" if I "feather" the bolt carrier when cycling by hand. However, they all cycle reliably when fired . . . YMMV.

Larry
Hits the firing pin like a ton of bricks... no problem there...
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Old 02-23-2010, 11:29 PM   #34
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Originally Posted by Elkaholic
I would like to talk to a guy out there but I’m not sure if he’ll be around. I don’t really have anything going on so whenever is good for you.
I'll shoot you a call when I know what's going on... I think it's a friend's daughter's b-day party...
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Old 02-24-2010, 07:20 AM   #35
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Quote:
Originally Posted by fingolfen
Update: I had time to do a fair amount of work on the beast tonight...

Here's what I've found so far.

No FCG - bolt and carrier cycle just fine with the recoil spring in place - no hangups.

FCG - with the trigger all the way back, the hammer will indeed be captured just fine by the disconnector.

Hammer needed major work, however, as it would effectively lock the bolt and carrier back if it wasn't held by the disconnector. I used a U.S. hammer as a guide and reshaped it. Now the thing doesn't lock up anymore.

Unfortunately I still get a little hang every time I cycle it at this point with the FCG installed. A light tap will clear it, but I do have to tap it every time. I haven't had a chance to try it with a few rounds as it's dark and rainy here...

Thoughts?
I'd say you GTG...I've only had one that did hang on the hammer and I cut the hammer back, but it would still hang some time. When I live fired it, runs fine. After about three nearly full mags (20 round per loading) it doesn't hang any more at all.

This rifle is a Tantal that a guy talked me into using a AKM receiver and FCG because he said I might have trouble with the Tantal inards, so it was a real mix and match build. But she runs wonderful now, I really was surprised that it "fitted" it's self just by putting some ammo down the pipe.

SO...I wouldn't trim any more off the hammer until you've had a chance to ammo though her.
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