Matt.Cross

Also from NC, welcome!!

It's going to be pretty tight until it gets broken in, I recommend a light coat of oil on everything in the bolt carrier group. The rifle isn't cycling at all, IE the bolt doesn't unlock and the carrier doesn't move? You may have issues with your gas system, that would explain both short stroking and failure to cycle. Check your gas block alignment with the gas port and make sure your gas tube is correct and installed correctly.

This and this.

Welcome from NC, and many thanks for your service. There aren't any stupid questions, with the exception of "Should I sell my AR?", so ask away.

Awesome to have you sir! Thank you for your service to this great country. I'm mightily pleased to have another machinist join our ranks, welcome!

.... and it works like a charm! Locks to the rear on empty with the PMAGs, just as it should. Now I have to function test live, and then add the AGB, rinse & repeat.

New buffer length, 5.200". I can't wait to get home and see if it's going to clear the bolt catch!

SLR Sentry 9 AGB and a Guntec AR-15 Armorer's wrench.

Ordered the Guntec from Optics Planet.

His buffer dimensions (for rifle length AR-10) are .012" longer than Pat's, for anyone curious.

@MikedaddyH smart-ass....

Don't let me discourage you, ask Mike whether or not I enjoy a slide-fire...

That sounds expensive....

Awesome!

I'll check it out. Pat Raley published some numbers too in the link I posted earlier, I had planned to use that, but there's probably no difference.

Jon, you really are evil. You need help buddy....

I need one. I want the most useful/functional tool that is reasonably priced. Post 'em up!

I'll bet you farted in it too, just to be spiteful....

Time for an update: I'm an idiot, a total and complete utter moron. Seriously, everyone gets a turn to slap me upside the skull and stomp my balls, believe me I deserve it. My only gas problem is with the quantity occupying space where brain cells should be. I shall explain. I've been tinkering around since adding the LAW Tactical adapter to my rifle, and I noticed that with an empty mag in the rifle, the bolt will lock to the rear (behind the catch) if you withdraw the BCG with the adapter in the open position. While that's normal function for most of you all, since my rifle has been built, the bolt has never locked to the rear on empty. I have always attributed that to two particular factors: 1. I have used (1st Gen) PMAGS exclusively in this build, and they are reputed to be inconsistent in function with various large AR platforms. 2. Both custom BCGs used in the lifetime of this build feature chamfers at the front of the carrier that override the bolt catch. Where the idiocy comes in, is how I've failed to realize the catch is supposed to hold on the face of the BOLT, not the carrier. So I began diagnosing why my carrier wasn't/isn't traveling far enough to the rear to function properly. The short answer is that my buffer is ~1/2" too long, explaining both my short-stroking/bcg overspeed issue, and the failure to lock back on empty. Doh! This became apparent once I compared my buffer measurements with the data mrraley published quite a while ago. Brownells sent me an Armalite AR-15 buffer! It's 5.875" and should measure 5.188"! (Based on this post.) So, while I will still manufacture my stainless heavy buffer, and add my SLR adjustable gas block to the system, I'm first going to modify the existing buffer to the correct length, and see if that corrects my function issues.

That's what I'm talkin 'bout!

Yeah baby!!!!! (18"-er too for that matter)

That's right, nothing but the finest accommodations for the ladies.

You too?!

That's a nice case!

An SLR Rifleworks Sentry 9 clamp-on! Click me!