Hello - I have questions in two areas:
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What stocks can I use with the GF3’s vertical picatinny rail at the rear of the receiver?
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What muzzle devices fit the stock threading (especially suppressors), or do I need a converter?
I expect you have a threaded combo block like the 104 uses, and it required an adapter. I used the griffin and its great. As for the stock, the only pic rail version i have experience with is the old style sig mpx folder and love it. JMAC makes a bunch of options vaguely similar style as well, but are more modular.
The Pic rail adapter should also be removable. Then any stock designed to work with the AKM platform should work. Should being the key word as AK parts are known to require fitting between different models. As for the muzzle break, If you get me the sku number you purchased, I can get you the thread pitch if its not listed in the description.
I’ve been to Griffin’s website and they’ve been out of their 24x1.5 to 5/8x24 adapter since Black Friday last year. I’m on the notification list for it. I don’t know if anyone sells the right adapter, so if these guys take forever, I guess I’m out of luck until then.
Can the picatinny block be removed from the rear of the receiver? It looks like it is permanenty affixed.
Try Capital Armory, Tarheel State Firearms, or Silencer Shop. Hansohn Brothers is also a good NFA dealer with their own line of products that fit various cans.
For me I would pull off the rear pic rail and put a ZenitCo stock on it. For muzzle adapters look at Griffin Armament.