Radioactive Report post Posted July 24, 2020 14 hours ago, Neptune47 said: So that we all know, DC Machine makes the majority of barrels that PSA is selling in todays market. Having some of these same problems I phoned a friend and took him my barrel. They checked it and I went over some of the concerns that I have seen here. The barrel was tested, like to the micron, along with checking the gas port. Micron=1x10-6 meters or approx .000039 inch I doubt it. It’s possible but doubtful. Quote Share this post Link to post Share on other sites
willbird Report post Posted July 24, 2020 2 hours ago, Radioactive said: Micron=1x10-6 meters or approx .000039 inch I doubt it. It’s possible but doubtful. to us mochinists that would be "four tenths of a tenth" which can be measured. GM engine heads we held a dowel hole diameter + - 12.5 microns. The old shcool guys would go "oh crap this hole is three thousance oversize"...and I would say "john those are microns, it is aluminum, and it is 105 degrees F just out of the wash process"....and I'd get a sheepish "oh yea hehe". Bill Quote Share this post Link to post Share on other sites
Radioactive Report post Posted July 25, 2020 4 hours ago, willbird said: to us mochinists that would be "four tenths of a tenth" which can be measured. GM engine heads we held a dowel hole diameter + - 12.5 microns. The old shcool guys would go "oh crap this hole is three thousance oversize"...and I would say "john those are microns, it is aluminum, and it is 105 degrees F just out of the wash process"....and I'd get a sheepish "oh yea hehe". Bill Yup I agree it could be done. I’m not a machinist by any stretch of the imagination but even if measuring the chamber dimensions probably not going that far out. What parts of a rifle would be measured that precise? Quote Share this post Link to post Share on other sites
98Z5V Report post Posted July 25, 2020 (edited) 2 hours ago, Radioactive said: What parts of a rifle would be measured that precise? Short answer is none of the parts. There's a tolerance on all of it, for the AR15/M16, and that's all in the TDP - Colt's "Technical Data Package." Eugene Stoner knows what the details of that are - he made it, after he made the AR-10. Colt bought the details - the TDP - for the M16 contract. If there's ever a "Mil-Spec" for this large-frame AR platform, it's the original Armalite AR-10. Knight's Armament hired Eugene Stoner for a reason - design the SR-25, which a varient of said rifle turned into the military M110. That's the "mil-spec standard" in the industry, because that's the only design the military ever used... Edited July 25, 2020 by 98Z5V Quote Share this post Link to post Share on other sites
Red Dog Leader Report post Posted July 29, 2020 UPDATE: Got to reshoot the afore mentioned rounds today. ~20 of each, in 2 different mags. rifle fed all of them flawlessly. I guess more ammo down the pipe is needed to be sure. If problems re develop I will fix gas port Thanks to all for the help. RDL... Quote Share this post Link to post Share on other sites
Red Dog Leader Report post Posted July 29, 2020 Of course, had the new buffer&spring in... Quote Share this post Link to post Share on other sites
shooterrex Report post Posted July 29, 2020 Glad you got it running right. Quote Share this post Link to post Share on other sites
Radioactive Report post Posted July 30, 2020 Good to see it working with the heavier buffer and hopefully plenty of lube. They really do need more than their smaller brother especially during breakin. Quote Share this post Link to post Share on other sites
Matt.Cross Report post Posted July 30, 2020 2 hours ago, Red Dog Leader said: UPDATE: Got to reshoot the afore mentioned rounds today. ~20 of each, in 2 different mags. rifle fed all of them flawlessly. I guess more ammo down the pipe is needed to be sure. If problems re develop I will fix gas port Thanks to all for the help. RDL... 1 hour ago, Red Dog Leader said: Of course, had the new buffer&spring in... Glad to hear that! Keep us posted. Quote Share this post Link to post Share on other sites
JMason5067 Report post Posted August 1, 2020 If it continues to run poorly 98Z5V is the man to listen to. Quote Share this post Link to post Share on other sites
98Z5V Report post Posted August 2, 2020 10 hours ago, JMason5067 said: If it continues to run poorly 98Z5V is the man to listen to. Thank you, my good man - I appreciate that. These things have been a headache for several years, as shipped. It's taken alot of time (both ways, back and forth with owners) requesting information, studying information, comparing information - testing and fixing some myself... It's not been an easy process, over the years. But there IS a pattern to follow to get them running tip-top, every single time, no matter what. The hardware is great - most of it - some of the specs on the individual parts, not so much. That's what needs changed. They'll never change it, tough - so we keep helping people with them, and make them run. Thanks for the props - it does mean alot. Quote Share this post Link to post Share on other sites
Dport257 Report post Posted January 14 Late to this thread, but I'll add my .2 cents. I got mine running and have been looking for articles to read. I had similar problems with PSA and after finding this forum 98Z5V gave me great info as as well as others in this thread. Had I not gotten a deal on the two PA-10' that I own and was staring over, I would go with another platform. However, the one I have in the thread below seems to run great now and I've had no issues since replacing the incorrect parts. If I had to do it over I wouldn't have bought any parts until I read the guys advice. For example I purchased an Odin Works adjustable buffer and gas block. Both are quality and haven't given me any issues, I just don't think I needed them after reading all the responses and advice here. I would have gone with the suggestions given here for spring and buffer then re-drilled the gas port. My build is here: Quote Share this post Link to post Share on other sites
Matt.Cross Report post Posted January 14 Glad your guns are running as they should've to begin with! Quote Share this post Link to post Share on other sites