New PSA P10 PROBLEMS FEEDING.

[Radioactive]

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.

[willbird]

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

[Radioactive]

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?

[98Z5V]

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

[Red Dog Leader]

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...

[Red Dog Leader]

Of course, had the new buffer&spring in...

[shooterrex]

Glad you got it running right.

[Radioactive]

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.

[Matt.Cross]

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.

[JMason5067]

If it continues to run poorly 98Z5V is the man to listen to.

[98Z5V]

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. 

[Dport257]

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: 

 

[Matt.Cross]

Glad your guns are running as they should've to begin with!