07-29-2013, 07:13 PM
Sounds like short-stroking. Did you try more than one magazine?
If everything regarding the gas system and mags checks out okay, a lighter weight buffer and / or bolt carrier might be an easy fix if you have extra parts. I suggest enlarging the gas port only as a last resort.
An 18" with rifle-length gas leans towards reliability issues with light bullets and fast-burning powders, but it should run on Hornady factory loads.
If everything regarding the gas system and mags checks out okay, a lighter weight buffer and / or bolt carrier might be an easy fix if you have extra parts. I suggest enlarging the gas port only as a last resort.
An 18" with rifle-length gas leans towards reliability issues with light bullets and fast-burning powders, but it should run on Hornady factory loads.
Drifter

