
Originally Posted by
ForTehNguyen
if you cycle the rifle manually are you able to pull the bolt back with little effort? If you take out the buffer spring, the correct one should be 11" long. Sometimes rifle buffer springs (14") make their way into lowers and it will not work in a carbine tube. Something easy to double check, and one of the first things to start eliminating sections of the gun that could be causing problems.
an AR is easily able to fire without lube, do you have a friend that has another AR15 bolt to swap out and check if anything changes. On a normal AR the bolt carrier should move very easily even without lube.
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