Tommygunwinter
Member
- Joined
- Dec 24, 2015
- Messages
- 9
hi all,
I know this is not a new topic and have read and applied what I found on other threads...but still have an issue.
I have a 16 inch Ruger 556 MPR that runs fine with both commercial 223 and 556 ammo as well as my reloads, which are 62 grain behind 22 grains of H335. Those rounds also run fine on my other AR, a combination of Aero Precision parts and 16-inch Faxon barrel.
However...
For a service rifle competition I built a new upper for the Ruger using a heavier ballistic advantage 18 inch barrel, a new Aero Precision upper receiver, handguard and low profile gas block.
That combination is very accurate, see photo, and with a half pound of lead added to the stock balances very well. However... It tends to short stroke.
The rifle operates correctly using higher pressure commercial .556 ammo, but with any other commercial ammo, as well as my reloads, which I want to use cause I find them very accurate, the bolt will not lock back, and will not chamber a fresh round. If I manually operate the bolt it's fine.
I've taken it apart, checked everything, even replaced the gas block, cleaned the bolt, etc. etc. I've ordered a lighter recoil buffer spring but I wonder if there is something I'm overlooking.
target below is off hand, iron sights at 100 yards
thanks for any help
I know this is not a new topic and have read and applied what I found on other threads...but still have an issue.
I have a 16 inch Ruger 556 MPR that runs fine with both commercial 223 and 556 ammo as well as my reloads, which are 62 grain behind 22 grains of H335. Those rounds also run fine on my other AR, a combination of Aero Precision parts and 16-inch Faxon barrel.
However...
For a service rifle competition I built a new upper for the Ruger using a heavier ballistic advantage 18 inch barrel, a new Aero Precision upper receiver, handguard and low profile gas block.
That combination is very accurate, see photo, and with a half pound of lead added to the stock balances very well. However... It tends to short stroke.
The rifle operates correctly using higher pressure commercial .556 ammo, but with any other commercial ammo, as well as my reloads, which I want to use cause I find them very accurate, the bolt will not lock back, and will not chamber a fresh round. If I manually operate the bolt it's fine.
I've taken it apart, checked everything, even replaced the gas block, cleaned the bolt, etc. etc. I've ordered a lighter recoil buffer spring but I wonder if there is something I'm overlooking.
target below is off hand, iron sights at 100 yards
thanks for any help