RPK issue: hammer/carrier interface

[Lone Eagle]

there are a lot of minor internal differences. one of those is that the '74 carrier and trigger group have slightly different geometry than a typical earlier AK-74/AKM design. the differences aren't enough to prevent the G2 trigger from working in a '74, but a trigger group with the correct geometry (e.g. Arsenal FCG) will operate smoother in an AK-74

Now you got my gears rolling.  Is it possible I got a RPK74 carrier?  The "Polish" M64's are mismatched, with only the front trunnion and bolt numbers matching.   I know Bulgy carriers interchange, as I'm running a SGL31 carrier in my SGL21 right now.

Nope. RPK74 carrier would not even allow an AKM/RPK bolt stem to be inserted, and the lockup cam surfaces in the carrier are wrong, etc.

AK-74 carrier works in the SGL-21 because the 21 has a 74 spec bolt, carrier, and front trunnion/chamber.

Gotcha.  Thanks.

[BatBoy2 75]

I had to ditch two Tapco triggers because they both would not allow the hammer pins to be fully inserted and seated within the receiver holes.

[AKBLUE]

Minor fitting should have fixed that pretty readily. A bit of round file to get clearance., maybe a burr etc. Not common in TAPCO FCG's as they generally fit well in any AK type in my experience.

[Danjal]

On the polish rpk series, and polish in general, I've found the hammer geometry to be off and hanging up the carrier on rearward motion. Enough in fact that I could pull the bolt back, hold it still, then release it without it going forward at all.