03-27-2011, 01:48 AM
CavTrooper Wrote:Thanks for the reply.
Ive cleaned the chamber very well, lubed and all that jazz, Im pretty anal when it comes to cleaning. Im wondering if theres a burr on the lugs in the chamber causing the lockup issues...
Anyhow, doing some searching, I found this fella describing similar issues and his resolution. Im not sure I want to take a sanding disk to my extractor but I do have an extra one laying around so I might give it a try.
Two issues plagued this barrel/bolt from the start. First was a failure to feed reliably from magazines. Second was intermittent failure to return to battery. Both of these issues I had addressed in the 7.62x39 chambering so it was not new discoveries. I'll cover the second issue first because sometimes that will also take care of the first. The bolt extractor has two sharp edges that tend to dig into the case rim preventing the bolt from obtaining full battery position. Remedy is too use Dremel tool with sanding disc to remove and polish these sharp edges that must slip over the case rim. Now rather than dig into the case rim the extractor will slip over the rim as the cartridge is chambered which will allow the bolt to obtain full battery position
Another thought I had was maybe the ejector was too tight/strong not allowing the bolt to fully close. Am I grasping at straws or does anyone think that its possible?
CT:
This doesn't happen to concern the highly coveted 'Stoner' barrel, does it? You didn't.......
Well, others I know have done the extractor buffing thing without any issues. However, they did it because those sharp edges were cutting notches into the rim of the brass. I can't recall them doing it because the cartridge was failing to go completely into battery.
Yours sounds like it is not going completely into battery. Shoulder bumped enough? If the shoulder and cartridge overall length isn't the issue, I would look at the headspace.
An out of battery firing is a bad thing. No doubt you are a bit nervous.
I wouldn't blast with it until I found out the problem and had it fixed.
LR1955