PSA M4A1 Stripped Lower Receiver

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PSA M4A1 Stripped Lower Receiver

In stock

$ 49.99

Quick Overview

Must be 21 or older to purchase.

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

WARNING: This product can expose you to the chemical lead, which is known to the State of California to cause cancer and reproductive harm. For more information go to (CA Health and Safety Code Section 25249.6).

SKU: 4272019
UPC: 4272019
MFR#: 4272019


  • Material: Made from 7075-T6 Aluminum
  • Finish: Black, Hardcoat Anodized
  • Caliber: Multi
  • Fire Selector: "SAFE" (Safe), "SEMI" (Fire), "AUTO" (Full-Auto)


California Buyers - stripped lowers are sent to California as "Long Guns" only. 

Please make sure the business name of the FFL you will be using is on your order.

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These limited-edition lowers are made using the most advanced aerospace manufacturing technology to produce the industries finest, forged Mil-Spec lowers. Our receivers are machined on a multimillion dollar, automated, manufacturing system which enables us to produce a product of unequaled quality and value. 

These forged lowers are quality made using material is 7075-T6 and are marked "CAL. 5.56 MM." to accommodate most builds. The finish is black hard coat anodizing per Mil-8625 Type 3 class 2.  Serial numbers have the prefix of "W-XXXXXX"

SKU: 4272019
SKU 4272019
Department Firearms - Receivers
Brand Palmetto State Armory
Daily Deal No
Daily Deal Expires No
Unit Price No
Youtube Video No
Free Shipping? No
Free Shipping Qty Label No
Free Shipping Qty No
SKU: 4272019

Questions and Answers

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Browse 55 questions Browse 55 questions and 111 answers
Will this make me a operator?
T B on May 13, 2019
BEST ANSWER: Yes unless you are in California then it just makes you a felon
Is this upper machined to accept an auto sear assembly ?
Alan J on May 9, 2019
BEST ANSWER: No Mr. ATF man. Nice try though
Is this fully of semiauto? It says full
Artyk on May 8, 2019
BEST ANSWER: It’s a fully semi automatic :-)
Are there plans to do a M16 marked lower?
A shopper on May 18, 2019
BEST ANSWER: There is an M16A2 marked lower in the works. No word on the final design or when it will be available, but it's in the pipeline.
Are these high shelf or low shelf?
Pat P on May 8, 2019
BEST ANSWER: All palmetto lowers are high shelf. I called and they stated they only produce high shelf lowers.
The way these are marked,can they be used for a pistol build? Tks Ray
Mary H on May 8, 2019
BEST ANSWER: ANY lower can be built as a pistol, regardless of engravings. The only thing you cannot do is initially build it as a rifle then later convert it to a pistol. If you build it as a pistol from the get-go, then you will be fine in the eyes of the ATF. And additional, but unnecessary, step you can take for piece of mind is to have PISTOL engraved on the mag well lower.
What’s the difference between low and high shelf?
Daniel K on Jun 1, 2019
BEST ANSWER: Low shelf has the ability to accept an RDIAS.
What is the significance of a "W" prefix serial number?
Terry D on May 25, 2019
BEST ANSWER: Only Colt M4 lowers start with the "W" prefix. FN M4s start with a "Y". This lower is clone correct for a Colt 1995-2003 production.
Are fire control markings on both sides of the receiver?
G L on May 9, 2019
BEST ANSWER: Yes. I just received a consecutive numbered pair and both receivers were fully marked on the right and left sides. I have never been able to successfully attach a photo, so you'll have to take me at my word.
are these m-16 milled pockets?
hookie on May 8, 2019
BEST ANSWER: I haven't seen any PSA Armory lowers that are not high Shelf
Any plans to produce lowers marked M16a1 ?
Bob N on Jun 13, 2019
Can I use a binary trigger with this lower?
Hagan R on May 24, 2019
Will psa be making lowers marked M16 ?
Allen on Aug 15, 2019
BEST ANSWER: They are currently working on an M16A2 lower. No word on release date yet.
How is this lower marked (on the magwell) on the opposite side?
Big daddy on May 27, 2019
BEST ANSWER: It's blank.
Can I use this lower to build a 7.62 mutant?
Hagan R on May 24, 2019
BEST ANSWER: If you are talking about building an AR that takes AK Mags, then no. If you are talking about an AR that takes AR 7.62X39 mags like C Products or ASC mags, then yes, however this would negate the description of "Mutant" IMHO.
Is this (M4A1 stripped lower) receiver going to be available again or was it a one time deal?
Shane R on Oct 12, 2019
I have DDM411 and a lwrc uppers would they have a tight fit on the lower? Don't want it to wiggle like my S&W T model 556
Hector M on May 18, 2019
BEST ANSWER: There might be a slight play from the front takedown pin post. Put a rubber o-ring around the front takedown post then put the upper and lower together. You may need to find the correct o-ring size but it will take the play away from the upper and lower.
In the reviews John W noted that it was “obviously not top drawer” what makes a lower “top drawer”?
George B on Sep 25, 2019
BEST ANSWER: Some of the higher end (ie, top drawer) lowers offer additional features such as integrated trigger guard, threaded bolt catch retaining pin, tensioning screw to remove slop between the upper/lower, flared magwell, etc. All of those features cost extra money via machining time. PSA is the best no frills lower you can buy. Like everything, more money gets you a better product.
This super cool, but my question is could this pose a problem with some LEO’s that happened to see these markings? Could it be more trouble to sort out than its worth? The whole, “what are you doing with government property?” And “we’re gonna have to take possession of this until you can prove otherwise...”. I would really like to have one of these but just a thought...
John C. on Sep 3, 2019
BEST ANSWER: These are replicas and theres are no restrictions on owning them. Colt makes their military collectors model " Property of US Gov't" marked and plenty of retro builders has marked their receiver this way too. LEO has bigger things to worry about than to question the validity of a marked AR lower. Hope this helps.
Will this kill t rex?
Shahid A on Jul 1, 2019
BEST ANSWER: It has been tested up to an Allosaurus. Once we can track down a Rex we will check back in!
Does this also come with the trigger guard or doe that have to be purchased separately?
Right to Live on Sep 8, 2019
BEST ANSWER: This lower does not come with a trigger guard. You can either find a lower kit that includes one or buy one separately.
Will this work for 300 aac?
David T on May 15, 2019
BEST ANSWER: Yes it will. 5.56 lowers are identical to 300 Blk Out lowers.
So if you put a bump stock on this it will make it semi auto only like in reverse????
Mike D on May 15, 2019
BEST ANSWER: Bored at home, eh ?
Can this be used for a 9mm pistol build?
Robert L on Jun 21, 2019
BEST ANSWER: To answer your question yes it can be used to build a 9mm AR pistol with the right conversion kit to do glock or colt pattern mags. For reliability I would buy dedicated lowers made to use for 9mm AR that are available from many vendors including PSA. Save this M4A1 marked lower for a military SOCOM clone build. Hope this helps the decision.
Can I still get this in California?
Michael G on May 15, 2019
BEST ANSWER: Yes, I just ordered a few.
Can you make a M16A4 lower next?
James A on Aug 4, 2019
RON D on Nov 7, 2019
BEST ANSWER: This is for an AR15. You’ll need a palmetto lower parts kit and then you’ll have yourself a complete lower half of a rifle.
With this lower work with the PSA 16" 5.56 NATO 1:7 Midlength Nitride 13.5" Lightweight M-Lok MOE EPT Rifle Kit w/ MBUS Sight Set?
Jason S on Dec 5, 2019

Yes, it will.

Best Regards,
Palmetto State Armory Customer Service
Are these require to be shipped to a dealer and does it have a complete serial number blank or partial?
Panhead on Jul 22, 2019

These must be shipped to an FFL and they do have a complete serial number.

Best Regards,
(Name of Employee Removed)
Palmetto State Armory Customer Service
Looking to build my first rifle. Will this stripped lower pair well with this Kit im looking to order? PSA 16" CHF A2 Mid-Length 5.56 NATO 1/7 13.5" Lightweight M-Lok MOE EPT Rifle Kit . I don't want to pull the trigger on this build until I know for sure I have the right stripped lower. Im also going to add the nickle boron bcg as well, And a premium charge handle, after I get this built. I got bills so i have to do this is steps. Thanks in advance.
ThtBoi on Jul 3, 2019
PSA M4A1 Stripped Lower Receiver
PSA M4A1 Stripped Lower Receiver
PSA 16
PSA 16" CHF A2 Mid-Length 5.56 NATO 1/7 13.5" Lightweight M-Lok MOE EPT Rifle Kit - 5165448203
BEST ANSWER: Yes, it will.


5.0 / 5.0
36 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Looks great, works great
Came in looking beautiful, nothing to complain about. Will definitely reorder
December 7, 2019
Official looking AR
Purchased this lower to build a M-4 style Coyote rifle. The quality is amazing with a great finish
November 12, 2019
3 months ago
Wish more companies offered civilian lowers with "select fire" and military style markings. Perfect for retro and mil-replica builds! Comes in a dark finish.
November 5, 2019
2 months ago
Its great!
Dont hesitate to purchase. Psa is good people, and they make good ar15 's.
October 27, 2019
2 months ago
Looks great!! , glad I purchased it
October 26, 2019
2 months ago
Very good receiver for a clone build. Good quality for a good price.
It doesn’t have the prancing pony, but this is the closest you’re going to get to a m4a1 clone build. Matches up very well with a colt upper, with nearly no slop. With the prices for true colt lower receivers being what they are its a no brainer. Good quality.
October 26, 2019
2 months ago
Very Nice Stripped Lower
I am very pleased with this lower even though I am not sure at the moment if it will be a pistol or a rifle or even if it will be 5.56 or 300 Blackout. However, I am leaning very heavy to the 5.56. I do know I will be placing a Fostech Gen II Echo trigger in this lower regardless of the end build.

Fishiness is exceptionally good and all engraved markings were even which made highlighting work out just fine. Mating it (as is and stripped) two three different lowers has me convinced there will be zero issues with that.

Just a FYI that I think you should be aware of but did not have anything to do with the quality of the lower so I did not remove a star. If you are in a hurry to receive your order, don't be and worse, just because PSA says they have shipped, your item can sit at there place for days before they get it to UPS. I inquired about receiving an "item shipped" notice an UPS for days saying they did not have it yet. PSA responded it had shipped and UPS could be behind in posting updates. Not true! Once UPS updated I could see all that had been done. PSA created a label and told me they had shipped on, 10/8 and UPS did not receive the shipment until, 10/10, 7:03PM. PSA needs to be more truthful with paying customers!
Right Side Clean
Left Side Clean
Right Side Highlighted
Left Side Highlighted
October 13, 2019
Perfect for an M4A1 clone build!
This is a great option if you are interested in building an M4A1 clone. There are other options on the market, but at a significantly higher price point. This lower is perfect for those who want a mil-spec quality part, but don't want to pay Colt or FN prices.
User submitted image
User submitted image
User submitted image
October 8, 2019
Markings, finish, and fit are PERFECT!
100% recommend. Used it to make my M4A1 service rifle clone using some of the actual components I took to Afghan, Iraq, or both. I wanted to leave the Army with "my rifle," and thank you for this product, the markings are spot-on to my issued M4A1. Mechanically perfect, finish was also flawless, definitely a great way to do an M4 clone build. Only missing the logo but of course that would bring up copyright issues, everything else is true to form.
Markings are as authentic as possible.
UID label I ordered from elsewhere, but it's great.
September 19, 2019
Good buy
Have bought several and very pleased with quality. They obviously aren't "top drawer" but the price says that.
Have never had a problem with fit or finish. Everything fits great and clearances are very good with PSA and other uppers. Will buy again.
September 13, 2019
7 months ago