I have a dpms 20" bull barrel upper with rifle length gas system and the RRa lower has a mil spec adjustable buffer tube(from larue) with a carbine buffer. I have been using federal and pmc 55 grain factory ammo. Sometimes the rifle cycles fine but alot of the time it will eject the spent round and not feed a new one. I have tried a mil spec buffer spring and buffer ( the larue came with a high silicone spring and not sure if it had a heavy buffer so put in a mil spec )
I have checked out the gas rings and they seem fine- carrier wieght wont colapse on the bolt.
Tried different mags. Guns lubbed. I would say 500-750 rounds down the tube.
What do you think?
I have checked out the gas rings and they seem fine- carrier wieght wont colapse on the bolt.
Tried different mags. Guns lubbed. I would say 500-750 rounds down the tube.
What do you think?