Please help !! ,
I built a M-16A1 clone , i used a M-16A1 upper assy. and a bushmaster lower ,with AR-15 trig.group.
The problem is that the gun keeps jaming - stovepipe style - with the next live round getting wedged up in chargeing handle , makeing pulling back chargeing handle to clear jam very dificult !
the bolt & carrier are U.S.G.I M-16A1 - the only prob. i can see is the carrier key has a flared out tip-( the part that fits around gas tube) - it doesnot bind on my gun , but appears to have more wear on it than my barrel - as though it was swaped at the retailer from another more used upper receiver assy.
i HAVE TRYED DIFFERENT MAGS , & AMMO -- SAME TROUBLE !
DO you think the problem is the carrier key ? , or the gas rings on the bolt ?
it can get real expensive buying replacement parts - when i cant pin point the trouble area !
PLEASE HELP !!!