Most AR owners clean the bore and wipe down the BCG. Almost nobody checks this — and it's one of the most important reliability factors on the platform.
Most AR-15 owners have a cleaning routine. Bore brush, patches, BCG wipe-down, fresh lube. It's a good start. But there's one step that gets skipped almost universally — and it's one of the most important reliability checks on the platform.
Gas Key Staking
The gas key is the rectangular block on top of the bolt carrier group. It's what directs gas from the gas tube into the BCG to cycle the action. It's held in place by two screws.
Those screws need to be staked — meaning the surrounding metal is physically deformed into the screw heads to prevent them from backing out under the vibration and heat of firing.
Unstaked or improperly staked gas key screws will back out over time. When they do, the gas key loosens, gas escapes, and the rifle starts short-stroking — failure to fully cycle, failure to eject, failure to feed.
How to Check It
Look at the gas key screws on your BCG. The metal around each screw head should show visible deformation — small indentations pressed into the screw head from a staking tool or punch. If the screws look clean and undisturbed, they may not be properly staked.
You can also check for movement: with the BCG in hand, try to wiggle the gas key. There should be zero movement. Any play means the screws are loose.
The Extractor Spring
While you're at it, check the extractor spring. The extractor is what pulls spent cases out of the chamber. A weak or worn extractor spring causes failures to extract — the case stays in the chamber and the next round tries to feed into it.
Extractor springs are cheap. If your rifle has significant round count and you've never replaced it, replace it. It's a five-minute job with the right tools.
Bore Inspection
A bore scope is one of the most useful tools in an armorer's kit. It lets you see inside the barrel — erosion at the throat, carbon buildup, rifling condition. Most shooters never look inside their barrel until something goes wrong.
If your rifle has significant round count, a bore inspection is worth doing. It tells you what's actually happening in there, not what you assume.
The Full Picture
Cleaning the outside of a BCG and running a patch through the bore is maintenance. Checking gas key staking, extractor condition, and bore health is inspection. Both matter.
If you're not sure what you're looking at, bring it in. A full inspection takes about an hour and tells you exactly where your rifle stands.
Want this work done on your rifle? Reach out directly — Louie handles every job personally.
Have questions or want this work done on your rifle? Reach out directly — Louie handles every job personally.
No online ordering. All work is scheduled by appointment only.