AK fire control group problems


Lee F
January 17, 2005, 07:23 PM
I posted this over on AR15's AK site also but I'm looking for any help I can get.

I have a SAR-1 of 2002 vintage with trigger slap so I purchased a Tapco G2 single hook fire control group at the gun show this weekend. Following the instructions on the Linux3 site I had the old set out in less than five minutes. Installing the new set only took a little longer in spite of the shepards crook. After getting everything put back in I found two problems.

1. If you thumb cock the hammer, while the bolt carrier group is still out, the hammer is caught and held by the disconnect. The disconnect will not release the hammer unless you compress the disconnect spring by hand. I ignored this for a second or two.

2. I re-installed the safety to find out it would not engage. The edge of the trigger is too high and the safety can't ride over the top of it. This is metal to metal contact and I had to remove the trigger.

I troubleshoot electronics for a living so I thought I could figure out the problem. I began by re-installing all the old parts, everything worked fine. Then I started substituting one of the new Tapco parts for one of the Century parts at a time. I managed to get all of the new parts to work except for the trigger. Now my question is this, which is more likely to be wrong a bad Tapco trigger or the hammer and trigger pin holes too close in the receiver? Tapco has a great reputation for backing up their products so I'm not concerned about the part but would like to make sure its bad before I start shipping things back. Thanks for the help,

p.s. I called Tapco after work this evening and they agreed with a poster on AR15 that I would have to file down the offending parts but quickly reminded me that would void the warranty. So much for AK's having interchangeable parts like AR's.

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dance varmint
January 22, 2005, 01:11 PM
The best place to ask is probably AK-47.net,

The slop in SAR manufacturing may be the culprit. I don't know if the Tapco trigger comes with its own hammer, but a mismatch between the SAR hammer and Tapco disconnector would be the problem, and those parts can't be filed down to fit. I have a Red Star adjustable trigger group (including hammer); no problems, nice pull. Typically you need to file
down the safety to fit it to the new trigger.

January 22, 2005, 01:24 PM
I see you have discovered the meaning of "minor fitting required" :D

Lee F
January 22, 2005, 06:15 PM
The SAR-1 is now 100%. The problem wasn't the disconnector spring or the safety selector lever it was the trigger itself. I installed the trigger into the frame without all the other FCG parts to measure how much material needed to be removed for the safety clearance. While I had it in there I noticed its movement was restricted by the front (ejection side) corner binding against the frame. I don't know if the trigger or the frame was out of specfication, but be when I filed off the front corner it worked perfectly. The hole in the receiver does not have square 90 degree corners but rounded contours.

The difference in the trigger is unbelievable. I've fired about a thousand rounds through this rifle in the past and never been satisfied with rapid fire performance. Now with the trigger slap and generally smoother trigger double taps and split times between targets is much better.

October 9, 2005, 02:54 PM
For a FCG do yall recommend tapco or redstar arms?

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