PSA Gen4 10.5" 9mm 1/10 Nitride 9" Lightweight M-lok Railed Upper - With BCG & CH - 5165449633

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PSA Gen4 10.5" 9mm 1/10 Nitride 9" Lightweight M-lok Railed Upper - With BCG & CH - 5165449633

In stock

Special Price $ 319.99

Regular Price: $ 479.99

Quick Overview

It is the customer's responsibility to be aware of all applicable laws and regulations regarding the purchase and ownership of uppers with a barrel length of less than 16". Federal NFA regulations are applicable to this item.

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: 5165449633
UPC: 5165449633
MFR#: 5165449633

PSA Gen4 10.5" 9mm 1/10 Nitride 9" Lightweight M-lok Railed Upper - With BCG & CH - 5165449633

Barrel Length: 10.5"
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 
Hand guard Type: PSA 9" Lightweight  M-lok Rail
Bolt Included: Yes, (Gen 4, Hybrid)
Bolt Steel: 8620, Nitride Treated 
Charging Handle included: Yes

Add To:

Barrel: 10.5" 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 9" 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: 5165449633
SKU 5165449633
Department Uppers
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: 5165449633

Questions and Answers

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Browse 38 questions Browse 38 questions and 71 answers
Will this work with a Colt magazine style lower?
Rod H on Oct 3, 2018
BEST ANSWER: It comes with a Gen 4 Hybrid 9mm BCG, so yes. It works with both Colt and Glock mags.
What is the difference between an H-9 Hybrid and a Gen 4 Hybrid BCG?
AZHTfreak on Oct 10, 2018
BEST ANSWER: The Gen 4 has an external extractor. They both function great.
Do you have lower for this upper?
Vic K on Oct 3, 2018
BEST ANSWER: Yes PSA has dedicated AR9 lowers available in either Glock or Colt style mags
Is this +P rated?
Mark P on Oct 13, 2018
BEST ANSWER: It can accept any 9mm rds. Some are more picky than others.
Would this upper have LRBHO if used on psa ar 15 stripped lower build ,using mean arms endomags?
David H on Jan 4, 2019
do I need a different buffer to run the 9mm?
ScottW on Nov 10, 2018
BEST ANSWER: Complete PSA AR9 comes with 5.5 oz buffer but I found that a replacement extended 7.5 oz cycled better.
Does it have last round hold bolt open?
Emerson S on Jul 5, 2019
BEST ANSWER: the upper doesnt contain the bolt hold open parts. that is in the lower, which this upper does work with lowers that have the bolt hold open feature.
Will this upper work with a Daytona Tactical lower?
Blaine H on Oct 31, 2018
BEST ANSWER: PSA says their uppers are meant to work with PSA lowers but I've seen a few build reviews on YouTube where they used PSA uppers with other maker's lowers without any problems.
Can this lower be fitted with the PSA 10.5" upper or does that go against ATF guidelines? Does the barrel have to be at least 16" for this lower to be legal?
Kenneth E on Dec 20, 2018
PSA Gen4 10.5
PSA Gen4 10.5" 9mm 1/10 Nitride 9" Lightweight M-lok Railed Upper - With BCG & CH - 5165449633
PSA 9mm Billet Complete Glock© Style MOE EPT Lower Receiver, Black
PSA 9mm Billet Complete Glock© Style MOE EPT Lower Receiver, Black
BEST ANSWER: No these can not be paired as that would constitute a short barreled rifle requiring registration as such with ATF. PSA has excellent selection of adjustable brace lowers which can be paired with this upper. I really enjoy mine.
Is the A2 bird cage pinned and welded? Or can it be removed?
Chad D on Nov 12, 2018
BEST ANSWER: It can be removed
Will this work with a spikes tactical lower with last round bolt hold open?
Ghfjdk22 on May 7, 2019
Is this a complete upper?
Dennis M on Dec 27, 2018
BEST ANSWER: Yes, it came with a bolt, bcg and charging handle. No sights, obviously....
does this use colt mags. clock mags or both?
cody r on Nov 12, 2018
BEST ANSWER: The upper can be used on both. I have the 8" version, mine works great with Glock mags.
If I was to swap to a different upper receiver do you think I will have any issues?
Isaiah S on May 8, 2019
Will this upper work with the new stern defense mag adapter which gives last round open functionality?
Jimbo on May 3, 2019
Will this work with a lower which includes a last round bolt hold open? #80percentlower
Ragingbull133 on May 5, 2019
Will this work with a AR15 lower?
Tyler H on Oct 11, 2019
BEST ANSWER: yes it will you will have to get a mag well adapter if you are going to use glock mags but if your planning on using colt mags you will need a dedicated colt lower
I'm assuming this can be used with a psa lower that says must be used with a hybrid upper?
Vtrigg212 on Jun 23, 2019
BEST ANSWER: Mine is on a standard psa ar9 lower. I have connected to other ar9 lowers and it cycled just fine. So it is the standard upper, with regular glock mag ar9bolt. And lower..
Dose this item ship to California?
Arthur H on Aug 22, 2019

We will ship this upper to CA. It is up to the buyer to make sure they configure it to CA and/or other local regulations.

Best Regards,
PSA Customer Service
Can I use this on my ar15 lower and then buy a magwell adapter to except glock mags and it run?
jeremy d on Mar 19, 2019
BEST ANSWER: You need to remember that if your lower started out life as a rifle, you cannot legally convert it to a pistol (barrel length less than 16”) without FIRST registering it as a SBR. Understanding and remaining in compliance with state and federal laws is your responsibility, not PSA’s. If your AR began life as a pistol then you’re not altering this by installing an upper with a barrel less than 16” in length.
Does this upper have last round hold open?
Dan H on Aug 12, 2019
BEST ANSWER: Uppers don't control last round bolt hold open ,that is done by the lower, receiver
Does this have extractor door cover? If not can one be installed?
John F on Jun 15, 2019
BEST ANSWER: With your are talking about the bcg dust cover the answer is no u can't add one ,I have this all I can tell is to buy it,the feed ramp and bolt make all the diff,no jams yet
Is this bolt glock compatible?
Jimbo on May 3, 2019
BEST ANSWER: Facepalm....... go do some research. (Google / YouTube). TLDR - go buy an endomag and call it a day. You can use your standard lower
Will this work with a AR15 standard lower?
Mitchell C on Apr 30, 2019
BEST ANSWER: Enter an es, it will work with any milspec AR-15 lower receiver. We have used this 9mm upper with the Stern Defense 9mm adapter for Glock magazines with great success, even in our M16 on full auto.answer to this question.
Anyone know if this will work with a fostech echo trigger?
Kyle S on Sep 23, 2019
BEST ANSWER: Yes, no reasons why it wouldn't. Echo trigger is attached to the lower.
Do this upper will work with Stern Defense mag adapter?
carlo on Aug 24, 2019
BEST ANSWER: Yes, be sure to use the stern break-in procedure though
Will this work on a Sig Sauer sbr lower?
HMRHD on Aug 16, 2019
BEST ANSWER: Yes, but since you're asking this question you probably have a 5.56 upper on now, you should shop for a buffer with more weight that the one you're using for the 5.56. Reason being that the 9mm is a straight blow-back operation.
What’s the best fitting lower with a arm brace for this upper??
Bruce W on May 2, 2019
BEST ANSWER: I like the SB3 brace, it's adjustable. I've also used the KAK brace. I had an extra DPMS lower that wasn't used.
Will this upper work with endo 9mm conversion magazines?
brandon J on Mar 19, 2019
BEST ANSWER: Haven’t tried this specific upper with endo mags, however since the bolt works with Colt pattern magazines in theory it should work.
What buffer will I need if I use this on my 5.56 AR lower?
Damond S on Jul 5, 2019
BEST ANSWER: I used a 6.5 oz extended buffer with mine and it runs great.


4.9 / 5.0
25 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Works 100% as expected. Accurate for barrel length.
October 18, 2019
7 months ago
Good upper
I bought this as an experiment to see how much I could save over buying a complete gun by using an AR15 lower with a mag-well adapter. I'm very pleased with the performance. My carbine buffer and spring work fine.
October 17, 2019
1 month ago
great upper to go with an fm products lower
i bought this upper to put on a foxtrot mike lower and so far im at 600 rounds in & quite happy with this combo. not a single hiccup or issue of any kind so far. i look forward to more range trips with this setup.
psa upper on fm products lower.
psa upper on fm products lower.
October 13, 2019
2 months ago
A great buy
I’m very happy with this upper. I am using endo mag 9mm conversions and I didn’t have to do any modifications at all. I popped it on my lower and it was ready to shoot. It’s a ton of fun.
September 6, 2019
3 months ago
Would recommend purchase to a friend.
Happy with purchase. Was waiting for the 8" to come back in stock but pulled the trigger on 10.5". Put it on the PSA lower and very pleased. No feeding problems with Magpul or Glock mags. Can't truthfully say yet about accuracy and bullet weight. Put a Tasco red dot on top, and was hitting 6" plate at 50 yards with 115gr. Have not put it on a rest and punched paper.
September 3, 2019
3 months ago
Fantastic upper. Shoots great. Very accurate. Great truck gun
August 30, 2019
3 months ago
PSA Gen4 10.5" 9mm
Perfect fit!! All that was needed was an appropriate buffer spring and 9mm magazine adapter. Works perfectly. Very happy!
August 23, 2019
3 months ago
It works and works well
It fights above it's price point, more rugged and durable mag catch/release. I have used Glock, KCI and ETS magazines without a hitch. I fired about 350 rounds of 115 and 124 grain FMJ and 124 grain Gold Dot JHP with zero malfunctions. I shot targets at 15 to fifty yards and continued to 100 yards. Mine is a pistol and 100 yards seems unlikely, but this upper will do it.
August 12, 2019
1 year ago
PSA 9mm Build
My new favorite SBR. Put this upper on a PAS lower that i built for a 16" 5.56. Only changed buffer to 7oz, and changed to pistol brace stock, bought some Endomags ( convert your 30rd pmags to 9mm). At the range punching paper got 1-2 " groupings at 50 yrds. with Sig Red Dot.Build one,You will LOVE it. THANKS PSA.... you guys are the best!
August 3, 2019
3 months ago
Great bang for you buck and recieved it quickly. I used it with a AR lower and the endo mag inserts and it worked. I ran different ammo to see if it didn't like something and only had issues with Perfecta brass they didnt allow the bolt to go all the way into battery. I definitely recommend trying different ammo to see what it will run but over all very happy with this product from palmetto definitely will continue to purchase more from them
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July 7, 2019
5 months ago