PSA AR15 Complete Rifle Lower Receiver A2 - 504399

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PSA AR15 Complete Rifle Lower Receiver A2 - 504399


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If you live in California, please read this notice before ordering.

SKU: 504399
UPC: 504399
MFR#: 504399

PSA Complete Rifle Lower Receiver A2

  • Lower Machined from 7075-T6 Aluminum Forging
  • Hardcoat Anodizing: MIL-A-8625F, Type III, Class 2
  • PSA classic fire control group
  • Mil-spec style  A2 stock with metal latch
  • rifle length buffer and spring
  • Un-notched Hammer compatible with 9mm use
  • Caliber: Multi


Due to state laws, this item cannot ship to California.

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PSA Complete Rifle Lower Receiver A2.  Just the thing for that A4 clone.  True mil-spec style dark grey stock that darkens with application of CLP.

  • Lower Machined from 7075-T6 Aluminum Forging
  • Hardcoat Anodizing: MIL-A-8625F, Type III, Class 2
  • PSA classic fire control group
  • Mil-spec style  A2 stock with metal latch
  • rifle length buffer and spring
  • Un-notched Hammer compatible with 9mm use
  • Caliber: Multi


Due to state laws, this item cannot ship to California.

SKU: 504399
SKU 504399
Brand Palmetto State Armory
Daily Deal No
Daily Deal Expires No
Youtube Video No
Free Shipping? Yes
Free Shipping Qty Label No
Free Shipping Qty No
SKU: 504399

Questions and Answers

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Browse 18 questions Browse 18 questions and 69 answers
What is the "length of pull' on the lower?
donny zoom zoom on Dec 22, 2018
Im building an A2 replica as accurately as possible to the one my dad carried in Iraq, can I get it in black?
Chris27A on Aug 15, 2018
BEST ANSWER: First cleaning with and CLP spray will darken the color from gray to a lighter black. Great lower so far.
Does think have to ship to an ffl or can it be shipped directly to me? Either way would be okay.
Keith M on Apr 23, 2018
BEST ANSWER: FFL because this is the part with the serial number on it but you can interchange any 16" or above upper on it I believe.
I bought the 20” barrel upper already and just bought this A2 lower. It’s at my FFL waiting for me to pick up, does it have both take down pins already installed in it ? Or just 1? Or will have have to buy 1 take down pin ? Let me know , thank you
Ryann T on Sep 4, 2018
BEST ANSWER: It is a complete lower. It has both pins (pivot & take down) installed. They are retained with springs and detent pins. Just add a complete upper.
Will it work fir an A-2 build?
Ted T on Apr 19, 2018
BEST ANSWER: Yes, it is designed to be the lower receiver for an AR-15 A2 build.
Does this have the storage compartment for the cleaning kit?
ShannonT on Jun 24, 2018
BEST ANSWER: Yes, it does come equipped with a storage section in the buttstock
Will it work on DPMS 5.56 upper?
James L on Dec 25, 2018
BEST ANSWER: I have this lower on a DPMS AP-4A and it’s good and tight. I did replace the buffer spring, selector, and trigger. It actually should work with any mil spec upper with an AR-15 sized upper receiver.
I want to build an A2 style rifle for hunting. Will the buffer spring in this work with 300 black?
Old Greg on Dec 9, 2018
BEST ANSWER: Possibly, it depends on how your upper is gassed. This is a rifle weight buffer so if you are planning on shooting supersonic ammunition it will probably work, but if you are shooting subsonic ammunition it might not cycle the action.
Will any standerd upperwork with this and does it come with buffer buffer spring does it take a m16 buffer or m4 style?
carl m on Dec 23, 2018
BEST ANSWER: It will work with any AR15 style upper but is generally used with rifle length gas system usually 18 or 20 inch barrel and it comes with rifle system buffer and spring.
I'm thanking of doing an 458 socom build would this work ? Thanks
Randall C on Aug 21, 2018

Its my understanding that any standard ar-15 lower should work with a 458 socom upper. However my PSA lower has really tight take down pins, not a huge deal to me as I like things tight.
Have a Colt A2 upper. It has larger pivot and take down pins than my DPMS Oricle does. What size pins does this have ? Will it be compatable with the larger Colt holes on my upper ?
Craaig S on Jan 8, 2019
BEST ANSWER: From factory they wind be, but you can purchase an adapter to fit them. They're 7 bucks on JSE surplus.
Would this work for a 6.5 Grendel build with Anderson upper and be tight? Buffer and spring heavy enough?
James T on Jul 21, 2018
BEST ANSWER: Yes it will work for a 6.5 Grendel upper. How tight the fit between the upper and lower is will depend on the tolerances of the two receivers. As long as the 6.5 Grendel isn't over or under gassed this buffer/spring combo will be just fine. This lower uses a rifle length buffer so there isn't a lot of options out there for a heavier weight buffer.
How many pounds is the trigger break, for the PSA AR15 (SKU 504399) trigger design ?
Roger B on Dec 5, 2018
BEST ANSWER: It's a standard AR15 single stage trigger, mine breaks cleanly at 5.2lbs
What kind of trigger pull , would I be looking at stock as it comes?
Twigzz88 on Feb 12, 2019
Does this come assembled or would I Have to assemble it either way doesn’t matter i me I was just wondering if it was RTR out of the box or not?
Daniel G on Dec 15, 2018
Compatible with
BCA AR-15 Complete Upper Assembly, 18" 4150 Parkerized Heavy Barrel, .450 Bushmaster, Mid Length Gas System, 1:24 Twist w/ 15" MLOK?
John K on Dec 9, 2018
What if the weight of this lower?
RussWilliamson on Jun 28, 2018


4.8 / 5.0
56 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Great quality at any price
Paired the lower with the PSA 20" upper for a perfect fit. No issues encountered thus far. Except having to pry it from the hands of anyone else that shoots it.
PSA 20" Upper, PSA Lower, Boyds stock. My new favorite rifle!
PSA 20" Upper, PSA Lower, Boyds stock. My new favorite rifle!
February 13, 2019
1 month ago
Awesome lower love psa always had good luck with there products only online gun store I shop at
February 2, 2019
1 month ago
Good value.Bought 2,One fit's loose.
One of the two that i bought is pretty loose in 5 different upper's that i tried it in,The other is as good as can be expected for the price range.
Check the stock screw.Both of mine were loose.
I will buy again if the need come''s up.
January 24, 2019
Excellent deal!
I paired this lower with the 20 inch freedom upper, and ran over 100 rounds through it with zero malfunctions.
January 2, 2019
Awesome product and fast shipping to FFL
December 25, 2018
1 year ago
Perfect for my affordable A2 build
Great quality and value. Very happy with this A2 build. My hand guard shield was a little loose inside, but I used some high temp silicon to fix that. Overall I would definitely recommend this upper for a classic build.
December 15, 2018
3 months ago
Top quality lower at a very fair price.
Great lower and love the fixed for my A2 build. Quality and price are top notch. Its Palmetto what more can you say!
User submitted image
Added Dec 13, 2018
December 13, 2018
3 months ago
Great Lower
This is a great lower. I noticed that one post mentioned a loose stock. Well, if you don't know how to tighten a loose AR stock, in my opinion you shouldn't be handling a weapon of this type. Another was rusty take down pins after a while. This is normal if you don't clean your weapon. I have a C*LT brand twin to this lower, and even it gets rusty take down pins if you don't properly care for it.

So all in all, this is a great lower. PSA has been a pleasure to deal with and I will be ordering again in the future.
December 11, 2018
Just what I was looking for
Exactly what I was looking for at a great price.
Replica M16 build
Replica M16 build
December 9, 2018
3 months ago
psa upper and lower
I have built 7 lowers 5 of them from psa I never had an issue with the lowers all the uppers I got were top notch all complete except 1 it had a small nick on the front pivot pin lug not a big deal it cant be seen when the upper and lower are together this was not ordered as a blem upper still bad ass and have never had a fail going to order another upper and build the lower
November 28, 2018

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