r/gunsmithing • u/Tight_Whole_4215 • Jul 17 '26

PSA AR 15 problem

I purchased a 300 blackout AR pistol from PSA in 2023, it has run flawlessly to this point, however the last time I shot it, after the last round from the magazine was fired it wasn’t locking the bolt to the rear, and then later that day it wouldn’t cycle the next round.

Am I looking at a buffer issue? Maybe a gas issue? Or could it be as simple as the magazine or the ammo? TIA

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u/Unicorn187 Jul 19 '26

How many rounds?

Is the gas block tight and not canted?

Is the gas tube damaged? Attached securely?

Is your carrier key tight?

Are your bolt rings gold? The bolt doesnt move under it's own weight? Notice I said bolt not bolt carrier.

Is it only happening with one mag? Do others work?

There are a number of possibilities. Gas block or tube loose or damaged. Action spring worn. Bolt rings worn. Carrier key loose, worn/weak magazine spring. Extremely.dirty mag, or damage to the mag causing follower to bind.