Hammer won't stay back, Why?

Hi Guys, I've got a semi-auto Yugo M70 AB2 and am having some issues with it. The hammer does not always stay in place after a shot has fired and the bolt slides back ejects a round grabs another and the hammer doesn't click and will actualy fall back forward and leave a very small strike on the next bullet but not fire it. Like the hammer just rode the bolt back and forward maybe. Kind of like the spring didn't quite let it go back all the way. It will do that every few rounds. Any ideas? I know that is getting into some scary territory for a semi, but I am thinking it should be an easy fix. possibly just a different trigger or bolt? Thanks in advance

What FCG you using?


Check your semi sear spring.


Also when you manualy cycle the firearm...... is it smooth? Does the hammer stay back?


Remove your top cover, (UNLOAD WEAPON) hold the trigger, pull the bolt carrier back and watch how the semi sear works.

Should be an easy fix.

A few things to check. Make sure the hammer isn't backwards. Make sure there is a disconnector spring, If it's a Tapco fire control group make sure there is a sleeve in the trigger and disconnector and last there was a recall of Tapco FCG's that have the disconnector spring hole too deep in the disconnector and this keeps the spring from having enough tension for the disconnector to hold the hammer.

Well its all the century trigger stuff and I have observed it is smooth when operated by hand, pulling the bolt back to load a round and releasing them firing. It will chamber another but won't fire but the hammer is forward, so you have to pull back eject that round and chamber another. I am not sure it is the bolt that came with the gun. I have a few and might have mixed them up when cleaning.

Well its all the century trigger stuff and I have observed it is smooth when operated by hand, pulling the bolt back to load a round and releasing them firing. It will chamber another but won't fire but the hammer is forward, so you have to pull back eject that round and chamber another. I am not sure it is the bolt that came with the gun. I have a few and might have mixed them up when cleaning.
YOU REALLY DONT WANNA MIX UP YOUR BOLTS. That will screw up your headspace, the ONE BIG NO NO with ak's

Bolt or Bolt Carrier....??? And bolt wouldn't affect the THS set up... Carrier mite, but not the bolt...

It's gotta be the THS set up... Somewhere in those 3 pieces(and the springs and sleeves)...

panzertruppe

Panzer is probably correct.

First check the things allenesogwat said. He knows what he's talking about.

Then, look here:

http://www.arizonaresponsesystems.com/notes/notesak/aktrigger/pageaktrigger.shtml

One more thing:

Check to make sure that the hammer spring has both ends over the trigger--that one is not off the trigger.

OK, so i feel stupid but somehow the disconector spring isn't there. Don't know how I missed it and especially when I went over everything the second time. Its been a while since I messed around with the ak's. One question though, the disconector doesn't actually grab the hammer once the bolt carrier has slid back forward to chamber a bullet. What exactly does it do? I've been studying that for a few minutes and am having a hard time seeing exactly what's going on. Also I never knew the bolt carrier would affect head space that much. All my aks are Yugo's but I guess there are still variances. I will have to take the caliper to it and measure for fun. Thanks for the help.

The disconnector holds the hammer until you release the trigger, at which time it releases the hammer onto the now available trigger.

The gun is now ready to be fired again.

IOWs the disconnector maintains semi-auto fire only.

The disconnector is what grabs the hammer when the trigger is pulled. The bolt carrier cycles so fast you can't let go of the trigger before it is back in battery. When you release the trigger, the hook(s) on the trigger move back over the hammer. At this point the disconnector has moved far enough back to release the hammer, it snaps up against the hook(s) and is ready to be released by the next trigger pull.

The carrier has no effect on headspace, but the bolt does. Normal manufacturing variances can be enough to cause a problem. They are usually marked with the trunnion number so you can match them to the gun when field stripping multiple rifles.

Basic function testing (evaluates function and safety of FCG and selector/safety).
--all weapons should be function tested prior to going out and by the end user prior to firing.
--Also should be done after any work on the FCG or selector/safety.

1] Remove mag

2] Clear weapon

3] keep pointed downrange

4] Rack bolt

5] With safety engaged squeeze trigger--nothing should happen

6] disengage safety

7] Squeeze trigger and keep depressed--should hear click of hammer coming forward

8] While continuing to keep trigger squeezed down, rack bolt back and release.

9] Release trigger and should hear lighter click as disconnector disengages hammer, releases it to be picked up by trigger.


A weapon that fails function testing is considered defective and/or unsafe. Situation should be rectified prior to firing.

Thanks guys for all your help. Very knowledgeable!

The Century Yugo M70 has a Tapco FCG. There was a recall of the Tapco FCG. Get another FCG. The hole in the disconnector for it's spring is too deep and it won't hold the hammer. JUst replace the FCG. You can get another Tapco FCG as they are fixed now.