06-11-2018, 05:27 PM
This is a gas system/recoil system issue most of the time, when you have Bolt Over Base malfunctions.
It's more common on 18" MLGS AR15s.
Due to the plug dwell time, cyclic rate can be too fast for the magazine to lift the cartridges up fast enough, so the bolt slips past the cartridge, and the carrier tries to drive it forward.
You end up with bolt lug dents on the shoulder of your cartridge usually, with the cartridge beat up pretty bad.
Gotta slow the cyclic rate down somehow. Pick one or a combo of these:
Adjustable gas
Heavier buffer
Heavier spring rate for the action spring
It's more common on 18" MLGS AR15s.
Due to the plug dwell time, cyclic rate can be too fast for the magazine to lift the cartridges up fast enough, so the bolt slips past the cartridge, and the carrier tries to drive it forward.
You end up with bolt lug dents on the shoulder of your cartridge usually, with the cartridge beat up pretty bad.
Gotta slow the cyclic rate down somehow. Pick one or a combo of these:
Adjustable gas
Heavier buffer
Heavier spring rate for the action spring
NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com