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Old 03-30-2013, 09:46 PM   #1
islandfocus2
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Default SAM7K Pistol - Replacing FSB, Top Cover & Trimming Barrel

Most of us know that the Arsenal SAM7K has a fake booster pinned on a NON-THREADED FSB plus the barrel is extended to the very tip of the fake booster. It really SUCKS that you just can't easily unscrew and remove the FAKE booster and replace it to whatever muzzle break you want.

So, I took it upon myself to go ahead and remove the FSB & Fake Booster and replace it with a new threaded FSB. I also trimmed out the barrel evenly along the front end of the FSB.

I know that some of you were skeptical about trimming the barrel because it may cause keyholing or that there won’t be enough gas pressure to push the piston back.

Well, I did a little research and compared the SAM7K vs. the SLR107-55 SBR. They both have the same twist rate and same size gas port hole. The SAM7K’s barrel is 2” longer than the SLR107-55. I figured that if I just carefully trim the barrel to the same length as the SLR107-55 it shouldn’t be a problem. So I did! I test fired 80 rounds today at 25-30 yards with NO PROBLEMS! NO KEYHOLING AND NO JAMS on a 30rd rapid fire magazine dump! I’m pretty sure that the SAM7K is still accurate beyond 30 yards. BUT, it’s hard to control the SAM7K with using a 2 point sling as your cheek rest vs. a triangle folding stock. (See photo’s below with targets at 25-30 yards)

I also don't like the NEW rear sight so I went ahead and bought a new top cover with the old style krinkov rear sight from K-Var. (Which I think was pretty expensive for a top cover)

Over all, I LOVE IT! I'm very happy with the results! I've attached LOTS of photos for everyone to look at my work progress from Start to Finish.

NOTE: I would FIRST recommend pressing the unthreaded FSB loose before trimming off the barrel. I've done the opposite by trimming off the barrel first and had a hard time pressing out the unthreaded FSB. SO I END UP DREMELING THE OLD FSB OUT. Took me awhile, I didn't want to scratch the barrel. But, I succeeded! NO SCRATCHES!

I'd add more pictures. But I'm only allow to add 25 photo's......

Feel free to ask me questions.



Remove the pin on the faux booster.


Pressing the faux booster off.




Faux booster removed.


I recommend removing both pins of the unthreaded FS/GB, press out the FS/GB just a little (2-3mm) before cutting the barrel. It's just easier to press out the unthreaded FS/GB after chopping the barrel short. Once you've got the unthreaded FS/GB loosen up, you can start cutting the barrel.




Smoothing out the muzzle using a dremel and sand paper.


Polishing the muzzle with a Dremel wheel polisher after removing the unthreaded FS/GB.


Pre drilling the new threaded FS/GB.


Carefully press the new FS/GB on to the barrel and center the pre-drilled holes to the existing pin slots on the barrel.


Re-installing the pins to the new threaded FS/GB combo using a press or punch and hammer.


To re-crown the barrel, I used a brass screw and some NAPA grinding compound.


Even a brass screw can produce a beautiful crown!


Don't forget to blue the pins and front muzzle.


Now, it's time to REPLACE the top cover! Use a dremel to smooth out ONLY one end of the pin.


Carefully punch the pin out.


RE-DRILL the center part of the pin if the pin is long enough to reuse.


Insert the pin back and use a punch to form a mushroom to prevent the pin from coming off. NEW COVER INSTALLED!




She's done! OH YEAH!!!




Here's the after picture with ALL that's been replace and done!!


This is at 25 yards.. Had to sit down to sight the SAM7K. It only took me 5 rounds to sight it in. After that, I shot standing at 25 & 30 yards.


Standing at 50 and 70 yards.


Final results.. VERY HAPPY!!!

Last edited by islandfocus2; 09-13-2017 at 03:43 PM.
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Old 03-30-2013, 10:01 PM   #2
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Default Well Done

Looks really nice.
I've got a SLR-106U pistol that I love.
Have been seriously thinking about a SAM7K too.
Two questions.
1) How's the 7.62 recoil compared to 5.56?
2) Does the milled receiver feel considerably more heavy than stamped?

Thanks,
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Old 03-30-2013, 10:18 PM   #3
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Very nice work and a great write-up. The Bulgy beer can is awesome.
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Old 03-30-2013, 10:24 PM   #4
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Originally Posted by Barth View Post
Looks really nice.
I've got a SLR-106U pistol that I love.
Have been seriously thinking about a SAM7K too.
Two questions.
1) How's the 7.62 recoil compared to 5.56?
2) Does the milled receiver feel considerably more heavy than stamped?

Thanks,
The recoil is not too bad. I have no problems controling the recoil with just using a sling as a cheek rest. Of course, a real stock would definately be alot better for stability.

As for the milled receiver, It's slightly heavier than than the stamp but not by much. I still would not shoot the SAM7K or the SLR-106U single handed like a hand gun. I'll always use a sling as a make believe butt stock for better control.
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Old 03-31-2013, 02:50 AM   #5
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Very nice work and a great write-up. The Bulgy beer can is awesome.
Yes! I love the Bulgy 4 piece FH. Now, that I saw your M92 with it on. I might just get another one for my M92 as well!
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Old 03-31-2013, 07:51 AM   #6
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Awesome work and great write up. Congrats!
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Old 03-31-2013, 01:30 PM   #7
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Awesome work and great write up. Congrats!
Thanks iklindo! I've finally got the SAM7K the way I invision mine to be.
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Old 03-31-2013, 01:48 PM   #8
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beautiful gun, would love to have that one
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Old 03-31-2013, 03:17 PM   #9
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Awesome!
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Old 03-31-2013, 04:32 PM   #10
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I have a question. Are those parts ordered from kvar? And if so which front sight block did you use and what threads did it have for the brake. I've been saving for the same parts and now just need help identifying the correct ones.
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Old 03-31-2013, 05:18 PM   #11
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I have a question. Are those parts ordered from kvar? And if so which front sight block did you use and what threads did it have for the brake. I've been saving for the same parts and now just need help identifying the correct ones.
The 4 piece Bulgarian FH (US MADE) I bought from CNC Warrior. It's the 24x1.5 RH threads. K-Var carries the Original Bulgairan one at $102 vs. the US Made from CNC Warrior at $85. They are both identical. I'm happy with the US Made from CNC Warrior. Very high quality. Here's the website:

http://www.cncwarrior.com/ProductDet...ductCode=23901

For the FSB & Top Cover is from K-Var.

http://www.k-var.com/shop/KR-008B.html

http://www.k-var.com/shop/KR-345B.html

As for the Bulgarian Hand Guards. I bought those at GunBroker for $46 total including S/H. I didn't like the origianl BROWN finish so I restained Sedona Red.
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Old 03-31-2013, 05:53 PM   #12
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Thank you very much that is more than helpful. I can't wait to order it and get to work. I think ill go with the cnc warrior piece to start getting some US pieces for 922r for when it gets sbr'd.
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Old 03-31-2013, 06:26 PM   #13
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Default 922r Blows

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Thank you very much that is more than helpful. I can't wait to order it and get to work. I think ill go with the cnc warrior piece to start getting some US pieces for 922r for when it gets sbr'd.
I'm new to all of this so double check.
But I'm pretty sure when you get the tax stamp for SBR?
You can say F U to 922r.
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Old 03-31-2013, 10:10 PM   #14
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That would be awesome the whole US part thing is rediculous I'm sure nobody here will argue that.
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Old 04-01-2013, 03:52 AM   #15
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Well done - and nice write-up!
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Old 04-01-2013, 10:01 AM   #16
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Good job, man...thanks for sharing!
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Old 04-01-2013, 11:43 AM   #17
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Thanks guys! Hope this will help as a guide for anyone who plans to do the same to their SAM7K.
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Old 04-01-2013, 11:47 PM   #18
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Looks great...!!!
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Old 04-02-2013, 12:01 AM   #19
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Sucks you live in a state that's a skeered of the eneffay. You gots the makings of one of them thar M4-SFs I saw in another thread.

Seriously, you did a damn fine job making it as right as you can. That is one sweet looking pistol you've got now.
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Old 04-02-2013, 01:48 AM   #20
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Sucks you live in a state that's a skeered of the eneffay. You gots the makings of one of them thar M4-SFs I saw in another thread.

Seriously, you did a damn fine job making it as right as you can. That is one sweet looking pistol you've got now.

Yeah, it sucks that WA State does not allow SBR ownership. We've been trying for the past 5 years to have our law makers review the SBR. At least we've got the law makers here in WA to pass a bill for civilians to now own silencers. We are still working and hoping maybe in the next 2-5 years that the law makers here in WA will grant us to own SBR's. But, I'm not holding my breath...
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Old 04-02-2013, 11:49 PM   #21
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Island I have one more question for you, as you can see I'm new to this so bare with me please. What plunger pin did you buy for the front gas block? Or did it come with one
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Old 04-03-2013, 12:41 AM   #22
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Island I have one more question for you, as you can see I'm new to this so bare with me please. What plunger pin did you buy for the front gas block? Or did it come with one
I'm actually using the same original pins. The new FSB does not come with any pins. Just the FSB only. You should be alright just using the original pins.
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Old 04-03-2013, 01:02 AM   #23
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Thanks I didn't think it would have a pin because arnt bothering to use it lol. Thanks my order is in, now time to find a smith or a builder in pittsburgh to pay or help me with the install, I don't have a press
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Old 04-03-2013, 06:10 AM   #24
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nice, so you just tap out the pin on the brake and off she goes? I am wanting to perm attach a fake can to mine so I can add a stock, I fired it in pistol config but I figured I would like it more in rifle configuration.

any recommendations on attaching a fake can? and im still trying to figure out what to do about a stock.
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Old 04-03-2013, 11:22 AM   #25
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nice, so you just tap out the pin on the brake and off she goes? I am wanting to perm attach a fake can to mine so I can add a stock, I fired it in pistol config but I figured I would like it more in rifle configuration.

any recommendations on attaching a fake can? and im still trying to figure out what to do about a stock.
Yes, just tap the pin out on the fake booster, lube it with WD40 then press it out. It should come off easy.

Here's a seller at GunBroker that sells fake cans.
http://www.gunbroker.com/Auction/Vie...Item=334806786
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Old 04-03-2013, 11:26 AM   #26
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Thanks I didn't think it would have a pin because arnt bothering to use it lol. Thanks my order is in, now time to find a smith or a builder in pittsburgh to pay or help me with the install, I don't have a press
Cool! Post pictures here once it's all done!
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Old 04-03-2013, 07:38 PM   #27
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Great job!
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Old 04-03-2013, 11:24 PM   #28
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I'm shocked you crowned a barrel, with a dremel...
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Old 04-04-2013, 01:00 AM   #29
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I'm shocked you crowned a barrel, with a dremel...
It worked for me. Here's a couple of more pictures that I didn't get to add on my first post since I was limited to 25 photo's.


First cut using a SAW!


This is after I cut the barrel with the saw.


First smoothing process using a dremel.


This one is smoothing out the edges in the inner part of the barrel.


This one is smoothing out the barrel with a demel stone.


I also used fine sandpaper to smooth it even more.


Smoothing out the edges using a file before installing the NEW FSB. This will prevent buring while pressing.

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Old 04-04-2013, 01:20 AM   #30
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Very cool write up. Thanks. BTW You think it would be possible to take it out a little further to see if it doesn't keyhole at the longer distances?
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Old 04-04-2013, 01:28 AM   #31
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Nicely done. Fantastic write up and photos. What is the lever on the left side of the pistol grip do?
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Old 04-04-2013, 03:02 PM   #32
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Nicely done. Fantastic write up and photos. What is the lever on the left side of the pistol grip do?
That's actually a safety/fire lever. The SAM7K has ambidextrous safety lever. It's pretty cool.
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Old 04-04-2013, 03:07 PM   #33
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Very cool!
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Old 04-04-2013, 04:40 PM   #34
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I wouldn't take out anymore barrel below the FSB (meaning the forward part of the FSB). I believe that the gas port hole is meant to be for 8.5 length barrel. If you go shorter you might not have enough gas pressure to push the piston back. Keyholing might be a possibility. So don't cut the barrel anymore below the front portion of FSB.
I think he meant take it out (to the range) and shoot it from farther away.
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Old 04-04-2013, 06:37 PM   #35
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I think he meant take it out (to the range) and shoot it from farther away.
Oh... OK!! Silly me! lol... If the barrel has problems keyholing, you’ll almost instantly notice it already even at 10 yards. I've shot a CIA AK-74 that has bad keyholing at 5-10 yards. It's very obvious and noticeable. The next time I go to the range, I’ll try 50-100 yards.
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