A few weeks ago I traded for an Anderson/DS Arms build, a 16" Midlength gas system chambered in 5.56. I have put about 200 rounds through it and am having some issues.
It will cycle and fire full spec 5.56 ammo (mostly Wolf Gold and a bit of Lake City M193) 100% fine, however, it will short stroke -every- single shot with any lower powered ammo, including American Eagle .223, Independence 5.56 "XM193I", and Silver Bear 62 gr hollowpoints. I am not ok with a gun that won't cycle every round I feed it with.
The gun is clean,I have carefully checked the gas block (it is a set screw, railed type, but it is in the right place and stays put, and there are no signs of a gas leakage). It has a standard Carbine buffer (3 steel weights) and I even tried replacing one of the weights with rubber with no improvement. I also removed and carefully re installed the gas block with no improvement.
With the lower spec ammo (mostly American Eagle .223 and Independence 5.56), 75% of the time it will eject, and simply skip over the next round. The other 24% of the time it will jam with bolt halfway across the ejection port, with a round at a sharp angle caught between the opening of the chamber and the bottom of the bolt face, often with a nasty dent/gouge in the cartridge. I have had a few failure to extract/ejects with the American Eagle and Independence, and one stuck case with the Silver Bear.
I have the same problem when using this upper on my brother's carbine lower, and when using his bolt in my gun. I have the exact same issue whether I am using PMags or USGI, and the mags sit in the exact same place as my dad and brother's rifle, so it is not an issue with the Anderson lower or the mags, or mag seating.
The day before I got this rifle, I put over 200 rounds of the Silver Bear through my Dad's Stag Model 4 20" rifle at an Appleseed event (3 Rifleman scores!
) with no issues. All of these ammo types function flawlessly in my dad's 20" rifle and my brother's 16" carbine gas Diamondback build. The Stag has about 400 rounds through it, and my brother's 16" carbine Diamondback is brand new, about 120 rounds through it. A few years ago I had an M&P-15 Sport which ran all of these specific types of ammo 100%, over 900 rounds.
The bolt catch on my midlength rifle is also defective, the tab which catches the follower to engage the catch is too short by less than a hair, and probably 3/4 of the time, it will not lock back on an empty even when cycled manually. I have a new bolt catch on its way.
Help? The gun has -never- successfully cycled anything but Wolf Gold or Lake City XM193.
It will cycle and fire full spec 5.56 ammo (mostly Wolf Gold and a bit of Lake City M193) 100% fine, however, it will short stroke -every- single shot with any lower powered ammo, including American Eagle .223, Independence 5.56 "XM193I", and Silver Bear 62 gr hollowpoints. I am not ok with a gun that won't cycle every round I feed it with.
The gun is clean,I have carefully checked the gas block (it is a set screw, railed type, but it is in the right place and stays put, and there are no signs of a gas leakage). It has a standard Carbine buffer (3 steel weights) and I even tried replacing one of the weights with rubber with no improvement. I also removed and carefully re installed the gas block with no improvement.
With the lower spec ammo (mostly American Eagle .223 and Independence 5.56), 75% of the time it will eject, and simply skip over the next round. The other 24% of the time it will jam with bolt halfway across the ejection port, with a round at a sharp angle caught between the opening of the chamber and the bottom of the bolt face, often with a nasty dent/gouge in the cartridge. I have had a few failure to extract/ejects with the American Eagle and Independence, and one stuck case with the Silver Bear.
I have the same problem when using this upper on my brother's carbine lower, and when using his bolt in my gun. I have the exact same issue whether I am using PMags or USGI, and the mags sit in the exact same place as my dad and brother's rifle, so it is not an issue with the Anderson lower or the mags, or mag seating.
The day before I got this rifle, I put over 200 rounds of the Silver Bear through my Dad's Stag Model 4 20" rifle at an Appleseed event (3 Rifleman scores!
) with no issues. All of these ammo types function flawlessly in my dad's 20" rifle and my brother's 16" carbine gas Diamondback build. The Stag has about 400 rounds through it, and my brother's 16" carbine Diamondback is brand new, about 120 rounds through it. A few years ago I had an M&P-15 Sport which ran all of these specific types of ammo 100%, over 900 rounds. The bolt catch on my midlength rifle is also defective, the tab which catches the follower to engage the catch is too short by less than a hair, and probably 3/4 of the time, it will not lock back on an empty even when cycled manually. I have a new bolt catch on its way.
Help? The gun has -never- successfully cycled anything but Wolf Gold or Lake City XM193.
