Cheap AR Build No Workie

Open forum for rifles.
Post Reply
User avatar
GasGuzzler
Moderator & Supporter
Moderator & Supporter
Posts: 2035
Joined: 26 Jan 2016 22:39
My Press Choice: Turret
Location: Cooke County, TX
Has thanked: 330 times
Been thanked: 500 times

Cheap AR Build No Workie

Post by GasGuzzler »

By swapping parts around and hand-cycling I figured the chamber was cut tight on a rig I built. Took a fired case and drilled out the primer pocket big enough to thread for an old cleaning rod I had. Threaded it in and silver soldered it in place, filled the hollow female threads at the other end to withstand the clamping force of the chuck jaws on my cordless drill. Lightly coated the case with valve lapping compound and honed the chamber until I could get trouble-free hand cycling. Had to clean the barrel with every test run.

Image

Then it still misfired but at least cycled when it did fire. Found the firing pin about 0.030" short as compared to another from a fully functioning rifle. Below find the non-scientific comparison. I switched the pin over to retest and ordered a couple stainless replacements. Everything then worked well.

Image
__________________________________________________________________________________________
I've always been crazy but it's kept me from goin' insane.
User avatar
RBHarter
Founding Member
Founding Member
Posts: 2040
Joined: 13 Mar 2014 19:45
My Press Choice: Single Stage
Location: The green hell 90 miles north of Texarka
Has thanked: 76 times
Been thanked: 670 times

Re: Cheap AR Build No Workie

Post by RBHarter »

Nice . I'm glad the fix was easy . I had a Savage with a lot of miss fires to start the fix was to set the barrel back an 1/8 turn . Fortunately I have all the tools .
No AR issues except one that ran great for about 500 rounds then jambed up with what I thought was a lead goober but after looking at a second upper from the same place it was probably junk in the preassembled upper . The second one actually had a broken drill bit in the gas port .......odd since they say every upper is test fired and that bit stuck out about .07-9 into a 223 barrel ..... It is what it is .
Just a Red neck,White boy, Blue blood American.....
Post Reply

Return to “Rifle Discussions”