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Thread: Well, crap...
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Old 11-15-2012, 20:32   #1
WoodenPlank's Avatar
Join Date: May 2010
Location: NW Florida
Posts: 7,960
Well, crap...

When I went shooting last week, my SBR starting short stroking for no discernible reason. Everything was relatively clean, well lubed, and it had never had problems before. Unfortunately, I had no spare parts or tolls with me, so I was kinda screwed on troubleshooting.

I took it home that night and cleaned the crap out of it, and relubed everything. Couldn't find any worn or busted parts, so I figured that maybe it was chamber filth from the steel cased Tula.

This week, I hit the range again - same problem. This time, I had spares. I swapped in a carbine buffer in place of the H2, no joy. Swapped out the BCM bolt carrier group for a crappy, worn out DPMS, and the gun ran.


Dropped the H2 buffer back in, gun still ran.

So, I swapped the BCM bolt into the DPMS carrier, and vice-versa. BCM bolt + DPMS carrier, and it ran. BCM carrier with DPMS bolt, no joy.

When I got home tonight, I started going over the BCM carrier. No obvious burrs or bad spots inside the carrier, so I checked the gas key. The staking on the front screw looked a little weak, so I checked the screw. One tiny bit of pressure later, and the damn screw turned.

To quote one of my favorite TV shows - "Well THERE'S your problem!"

So, I tried to tighten the screw down more...

and more....

and more....

This damn thing is stripped!

I can't get the screw out because of the staking, but the staking wasn't enough to stop it from spinning.

Lesson learned - Even BCM can screw (heh) up every now and then. I've only had this BCG for about 6 months, and it's only seen about 500 rounds (work has been a ***** lately), so it's definitely not due to use or abuse. I've already got an email in to them, so I guess it's wait and see to find out what they are willing to do to fix it.

Second lesson learned - it doesn't hurt to double-check gas key screws, even on bolt carriers from higher end companies. Just because it LOOKS staked doesn't mean it's really secured.
Never argue with an idiot. They will drag you down to their level and beat you with experience.

Last edited by WoodenPlank; 11-15-2012 at 20:35..
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