happyC@mper
Bearcat
- Joined
- Mar 20, 2018
- Messages
- 6
I bought a brand new ar556 MPR last week. I took it out on Saturday and shot 20 rounds, only 3 of them cycled. The rest of the shots either failed to grab the next round or stove-piped. In all cases, the included pmag had 3 rounds to start with.
I took the gun home and disassembled it. I cleaned and generously lubricated the BCG. Today I took the gun out again and had the same result. 16 rounds fired, each time with 1 round in the magazine. The bolt locked back only 2 times.
Today I also tried some other things.
BCG - I borrowed the BCG from my friends Ruger AR556 and tried in my gun - same failure to lock back the bolt. I tried my BCG in his rifle - cycled and locked back as it should. Summary: my BCG is not the problem.
Magazines - I have the 30 rnd pmag that came with the rifle and also 2 brand new 30 round pmags. I tried each - same failure to lock back the bolt. Summary: magazines are not the problem.
Ammo - I tried several different kinds of ammo. SSA (Nosler) 556 55gr BT, TulAmmo 223 55gr HP, 223 55gr handloads. All ammo behaved the same - same failure to lock back the bolt. Summary: ammo is not the problem.
I don't feel any burs in the chamber or barrel. I have cleaned / lubricated it. It appears to be shiny and smooth to my eye.
I think my problem is either the gas block or the buffer / spring. I have not yet removed the hand guard because I thought the gas block was pinned. Does anyone know if that is true? What would I look as far as issues with the buffer / spring?
It is discouraging to get a brand new gun and have issues like this. Anyone have any suggestions?
Thank you.
I took the gun home and disassembled it. I cleaned and generously lubricated the BCG. Today I took the gun out again and had the same result. 16 rounds fired, each time with 1 round in the magazine. The bolt locked back only 2 times.
Today I also tried some other things.
BCG - I borrowed the BCG from my friends Ruger AR556 and tried in my gun - same failure to lock back the bolt. I tried my BCG in his rifle - cycled and locked back as it should. Summary: my BCG is not the problem.
Magazines - I have the 30 rnd pmag that came with the rifle and also 2 brand new 30 round pmags. I tried each - same failure to lock back the bolt. Summary: magazines are not the problem.
Ammo - I tried several different kinds of ammo. SSA (Nosler) 556 55gr BT, TulAmmo 223 55gr HP, 223 55gr handloads. All ammo behaved the same - same failure to lock back the bolt. Summary: ammo is not the problem.
I don't feel any burs in the chamber or barrel. I have cleaned / lubricated it. It appears to be shiny and smooth to my eye.
I think my problem is either the gas block or the buffer / spring. I have not yet removed the hand guard because I thought the gas block was pinned. Does anyone know if that is true? What would I look as far as issues with the buffer / spring?
It is discouraging to get a brand new gun and have issues like this. Anyone have any suggestions?
Thank you.