The ~whatever the proper name for the protrusion on the bottom tube~ is longer than mil-spec. It extends about 3/8" closer to the threads than a true mil-spec tube. Not a problem if you're pinning a collapsible stock, but it's incompatible with the Magpul MOE fixed stock. It blocks half of the hole where the set screw passes though the stock. Wasn't a big deal because I had a spare tube lying around, but I figured I'd pass it along.

I am shocked! Someone else on the board recently had a similar issue with receiver extensions bought off Amazon or EBay or something.

LMAO, I'd have zero sympathy for whomever that was.

I am shocked! Someone else on the board recently had a similar issue with receiver extensions bought off Amazon or EBay or something.

I don't buy gun parts off either of those sites.

PSA and EBay? Me too.

Fwiw psa has been reeeeeaaallllyyy good for me. I've had great experiences with them

 

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Fwiw psa has been reeeeeaaallllyyy good for me. I've had great experiences with them

 

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Me neither never had problems building with PSA parts. As a matter of fact I have used the same setup as the OP on multiple AR setups at multiple times. The setscrews cleared on all three of my setups. Sorry to hear that it didn't work for you.

come to think of it i had an issue with psa's lower parts kit as well. the damn mag release button was not threaded properly and it was missing the selector detent. they were cool about it but still...

I JUST finished helping a friend build his Mega forged lower receiver, using a PSA LPK,

I found that the trigger group sucked, and the trigger pins were too large in diameter.

I replaced the trigger pins with a spare set of Colt pins I had, which fit perfectly.

 

All other parts fit perfectly, and functioned 100%.

PSA and EBay? Me too.

I've yet to use anything PSA, but a stripped lower is in the plans.

I've yet to use anything PSA, but a stripped lower is in the plans.

I might have a spare laying around.

Me neither never had problems building with PSA parts. As a matter of fact I have used the same setup as the OP on multiple AR setups at multiple times. The setscrews cleared on all three of my setups. Sorry to hear that it didn't work for you.

K

 

That's why I put "MY" in the thread title. I figured they probably buy in bulk from whatever supplier is cheapest on any given day. I just had bad luck. I've got a collapsible stock I'm planning to pin for my next build, so I'll just use it for that.

so the gist is, expect a high volume seller to occasionally have out-of-spec parts, and that your number might come up on that day.

If it were me, I would buy a complete LPK from ALG Defense with an ACT triggger. They make a great trigger and a great kit.