Due to higher than average order volume, please expect shipping times to be delayed up to 10 business days. Please expect longer wait times for Serialized items (FFL required).
Due to higher than average order volume, please expect shipping times to be delayed up to 10 business days. Please expect longer wait times for Serialized items (FFL required).
PSA Gen4 16" 9mm Nitride 1/10 13.5" Lightweight M-lok Railed Upper - With BCG & CH - 5165450305

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PSA Gen4 16" 9mm Nitride 1/10 13.5" Lightweight M-lok Railed Upper - With BCG & CH - 5165450305


Quick Overview

WARNING: Handling firearms or firearms parts can expose you to lead and other petroleum products known to the State of California to cause cancer, birth defects, or other reproductive harm. Wash hands thoroughly after handling. For more information go to www.p65warnings.ca.gov (CA Health and Safety Code Section 25249.6).

SKU: 5165450305
UPC: 5165450305
MFR#: 5165450305

Barrel Length: 16"
Barrel Profile: A2 Style
Barrel Steel: Chrome Moly Vanadium 
Barrel Finish: Nitride 
Chrome Lining: No
Muzzle Thread: 1/2-36
Chamber: 9mm (9x19)
Twist Rate: 1 in 10"
Barrel Extension: 9mm
Muzzle Device: A2 Style Flash Hider
Receiver Material: Billet 7075 T6
Receiver Type: Slick Side 
Handguard Type: PSA 13.5" Lightweight  M-Lok Rail
Bolt Included: Yes, (Gen 4, Hybrid)
Bolt Steel: 8620, Nitride Treated 
Charging Handle included: Yes

Add To:

Barrel: 16" chrome moly steel barrel. Chambered in 9mm, (9x19), with a 1/10 twist. The barrel is nitride treated for durability and finished off with a Palmetto State Armory 13.5" Lightweight M-Lok free-float rail and a 9mm birdcage flash hider. 

Upper: Billet 7075-T6 A3 AR upper is hard coat anodized black for durability.  These slick side upper receivers are made for us right here in the USA.

Bolt Carrier Group: Gen 4 Hybrid 9mm BCG.  Nitride treated 8620 steel, with enhanced firing pin and external 5.56 style extractor. The bolt carrier group is compatible with most aftermarket fire control groups. 

SKU: 5165450305
SKU 5165450305
Brand Palmetto State Armory
Department Uppers
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: 5165450305

Questions and Answers

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Browse 20 questions Browse 20 questions and 26 answers
Will this work with a psa ar15 lower using a Stern defense Glock mag adapter?
Jon R on Jan 31, 2019
BEST ANSWER: As is no, Stern Defense has a very reasonable bolt modification that will allow it to work.Enter an answer to this question.
Compatible with ar15 lower receivers? Or need some adapters?
Fabricio on Jan 10, 2019
BEST ANSWER: yes it does
Do these have a last round bolt hold open feature?
Bigbuddyboy on Feb 14, 2019
BEST ANSWER: That would be a feature of the Lower receiver. not the upper.
Does this use a standard AR-15 Charging Handle, or does it use a proprietary PSA 9mm Charging Handle?
Connor G on Jan 28, 2019
BEST ANSWER: Look at the very last line in the product description block:

Charging handle included: YES
Will this work with the EndoMag and a regular AR PSA lower?
Mike P on Feb 19, 2019
BEST ANSWER: Yes it will work. I use the setup with a RRA lower and endomags.
Hi will your 9mm upper work with MEAN EndoMag 9mm ? Pros and Cons
Dave H on Feb 17, 2019
BEST ANSWER: Mine works great and has bolt hold open on last round. I don't have PSA lower though.
When will you stock the 9mm lower with the glock magazine?
Claire on Feb 17, 2019
Just curious on Jan 11, 2019
BEST ANSWER: Yes, use a magazine adapter
Is this upper compatible with S&W M&P magazines?
Ranny R on Jul 2, 2019
BEST ANSWER: It depends on the lower u put it on if it’s a ar15 platform then yes it will work but you have to get a mag conversion kit for the mag or you can just buy a ar9 lower and use Glock mags or colt style I’d choose the Glock style
Will this upper work with a Foxtrot Mike lower???
JESSE J on Aug 24, 2019
BEST ANSWER: I used a Spike's Colt SMG lower and it works like gangbusters! The dimensions should be standard, so I 'spect Foxtrot Mike's should work, too.
Will this work with a Foxtrot Mike dedicated 9mm lower and parts kit?
fcasontoo on Nov 22, 2019
BEST ANSWER: I don't see why not, as long as it's a standard type AR lower (which from the product write up it appears to be). I personally bought a standard AR15 lower and purchased a Stern Defense 9mm glock mag adapter to fit in the mag well of the 223/5.56 lower. This 9mm upper I purchased fit the lower receiver fine, however I haven't taken it to the range to shoot with it yet.
Two questions: 1) Is this upper compatible with PSA's Glock conversion block, and 2) any issues using PSA's 2 stage trigger and light primer strikes? Thanks.
Earl S on Oct 14, 2019
BEST ANSWER: #1, I haven't had any trouble what so ever with the PSA lower using Glock mags. Glock mags fit great and feed well, as do Mag Pull Glock type mags, no trouble with them either.

#2 No light primer strikes with my PSA 2 stage trigger, I have had the weapon for 7 months and have fired 1k rounds through it, no problems at all.
I am curious about what is new about the gen4 compared to previous generations of Ar9? I have done some searching but have not found any solid answers. Thank you!
Travis D on Jan 19, 2020
BEST ANSWER: Nothing as far as I know just fixed reliability issuues!!
What kind of buffer tube it's compatible with?
Alex V on Aug 13, 2019
BEST ANSWER: Since the buffer tube is attached to the lower, that is irrelevant to the upper. Although you didn't ask, you should use a substantially heavier buffer than a standard 5.56 buffer because this 9mm upper (and most others) is simple blowback. Get a buffer specifically for 9mm. The length of the buffer needed may well be different depending upon whether you use a Colt SMG-type lower, or a Glock magazine lower.
Is this compatible with your Betsy Ross I Stand 9mm PA lower receiver?
Johnboy71 on Jul 11, 2019

Yes, it is.

Best Regards,
(Name of Employee Removed)
Palmetto State Armory Customer Service)
Does it include Last round bolt hold open feature?
Neub18 on Feb 15, 2019
BEST ANSWER: Mine does, I use a Pmag modified with an Endomag insert.
Will this upper fit my foxtrot fm9 lower with LRBHO?
M92 on Feb 17, 2020
Is the flash hider pinned and welded on palmetto uppers? Please answer only if you know 100% don’t care about other brands asking about palmetto only
Justin S on Sep 26, 2019
Will this upper work with the Freedom Ordnance fx9 lower? Also, if using a standard Ar15 lower do you have to swap out the trigger assembly for a 9mm one?
Damien K on Jul 17, 2019
What is the overall weight of this upper ???
Big lew on Jun 5, 2019


4.8 / 5.0
8 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
The good, the bad and the ugly
The good. This thing shoots pretty good. Using Winchester 115 gr FMJ and 147 gr Ranger T I was getting about 2 inch groups at 50 yds, using a basic RDS.

The bad. The finish is sort of a matte black with a texture sort of look. It does NOT feel like a texture finish, just looks like it. A total mis-match if your going to attach this to a mil-spec AR lower like I did.

The UGLY. I'm running this on an Anderson AR lower with a Guntech mag well adapter block, Colt mag style. As soon as I assembled and inserted the first mag I knew something was not right. The mag refused to lock in and when I checked the mag after two attempts it had wear on the feedlips. I disassembled the upper from the lower and found no interference there. I checked the inside of the upper and saw where the mag had rubbed on the interior contour of the upper. Basically the bottom most radius where the upper had been machined for the round bolt was preventing the mag from going high enough for the catch to lock it into place. I could not lower the adapter block because that would cause feed problems. I used a flat needle file and relieved the interior of the upper and now everything works fine.
Finish mis-match
Clearly no interference between lower and mag
Interference in upper
February 27, 2020
2 months ago
Put 100 rounds through it so far with zero issues. Fires great and is super smooth.
October 11, 2019
7 months ago
ar 9mm
I didn't want to be bothered with a 9mm adapter for Glock or Beretta mags for my AR and I found Endomag where I could convert a .223 Pmag into a 9mm. Ordered the PSA Gen4 9mm upper and it works great. I have had no malfunctions. It's a lot of fun to shoot. Would highly recommend.
September 24, 2019
8 months ago
Looks great out of the box functions flawlessly. Paired with a Anderson stripped lower built with Aero parts kit and a Sterns Defense Glock magwell adapter.
July 9, 2019
10 months ago
Love it. Fit and finish are very good
I Recommend this upper to anyone considering a 9 mm build
User submitted image
User submitted image
June 2, 2019
12 months ago
Worth it.
Great upper. Using a Foxtrot Mike 9mm lower, replaced the stock charging handle with a BCM ambi charging handle, and using an RDS. Very accurate with consistent hits on a 12 inch steel target at a 100 meters.
May 8, 2019
1 year ago
Very happy with this upper.
Very pleased with this upper. Mated to PSA lower and runs flawlessly. For a 9mm I'm happy.
February 9, 2019
1 year ago
Works great
I have had great success with this upper.
January 30, 2019
1 year ago

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