I have a romanian parts kit put into a armoury usa 1.6mm reciever and im having some trouble with the bolt sticking.  I have the G2 fire control group in there too.  The bolt seems to hang first when i pull it all the way back to the buffer it will just stay. With slight pressure it will go forward a little more to almost inline with the reciever support pin just over the mag release.  A little pressure again and it will fall home and close.  I havent taken it to the range yet but would like to try to fix it if there is a problem before i go there because the range is 45 min away.  I would be really annoyed if i drove all the way there just for it to jam.  If i just pull it back and release it like it were firing it will not hang because i guess there is enough force to push it past.  It just hangs when i pull it slow.  So basically is this a problem or not and what can i try to do to fix it if it is.  Thanks, Major
       

it should be fine. its probably hanging in the place upper rail is slotted for removing carrier.

That is common.  It will probably wear in.

 You mentioned a buffer.  Aftermarket recoil buffer?  Removing that would be a good first step if the rifle doesn't function flawless.

I too have a 1.6 armory USA receiver. I used it on my Bulgy AK74 build. when I first got it I pulled it out of the box and tried to fit the bolt carrier into it. it was tight,rear to front. then I read the paper work they sent with the receiver on how to dremel the underside of the top lip of the receiver, to remove a little material as to match a 1mm reciever thickness that the bolt was meant to ride through. after completion It was still a little tight,locking up on the hammer alittle(as dicussed above) but after 100 rnds. she works like my other AK's hope this helps. by the way, the 1.6 is a nice receiver but FYI if I had to do again I would just go with the 1mm. I had to machine the front trunnion,rear trunnion, and stock to fit the thicker receiver.

Excellent advice on the LIGHT trimming the undersides of the rail with a dremel!

Helped me out!