PSA PA-9 Gen4 10.5" 9mm 1/10 Nitride 12" Slanted M-Lok Railed Upper With BCG & CH - 5165449744

More Views

PSA PA-9 Gen4 10.5" 9mm 1/10 Nitride 12" Slanted M-Lok Railed Upper With BCG & CH - 5165449744

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: 5165449744
UPC: 5165449744
MFR#: 5165449744

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: PSA Fluted Flash Can
Receiver Material: Billet 7075 T6
Receiver Type: Slick Side 
Hand guard Type: PSA 12" Slant 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 12" Slanted Lightweight M-lok free-float rail and a PSA Fluted Flash Can. 

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.

Flash Can: Palmetto State Armory Fluted "FLASH CAN".  This is a solid 6061 aluminum device that is designed to direct muzzle gases and the muzzle flash forward.  Threaded 1/2-36 for 9mm.  Black military-style hard anodizing.  THIS DEVICE IS NOT DESIGNED TO REDUCE RECOIL, MUZZLE RISE, OR FLASH SIGNATURE. This device is designed to direct gasses and noise forward away from the shooter and enhance the weapon's appearance.

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: 5165449744
SKU 5165449744
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: 5165449744

Questions and Answers

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 26 questions Browse 26 questions and 25 answers
Can I use this upper on a Glock magazine compatible NEW Frontier Armory lover?
Ciro C on Oct 7, 2018
What is the difference between an H-9 hybrid and a Gen 4 hybrid BCG?
AZHTfreak on Oct 10, 2018
will this fix on a standard Ar lower? If so I will need a magazine adapter for the 9mm mags.
Dennis D on Oct 7, 2018
BEST ANSWER: If your lower is not a 9mm AR lower you will need a mag adapter.
Will this upper work with the will this upper work with the fostech binary trigger, version 2 (doesn’t need proprietary BCG)?
David K on Oct 17, 2018
Will this work with the PSA colt style magazine lowers?
Rod H on Oct 5, 2018
Will thia work on new frontier armory lower using mp5 mags?
Anthony P on Oct 7, 2018
BEST ANSWER: No it needs Glock specific mags
is this upper legal as a rifle? Jon
Jon on Oct 14, 2018
BEST ANSWER: No, barrel must be 16" as a minimum, unless you purchase the SBR Stamp. If you go with a flash can or other muzzle device to get it to 16" then that device must be drilled and pinned in place so that it is considered "permanent".
Will this work with Golck mags ?
York P on Nov 22, 2018
BEST ANSWER: This is an upper, not a lower. If you buy a lower that accepts Glock, then it will work.
Will this work with a psa -px 9 ???
Anthony M on Oct 29, 2018
Will this work with standard p-mags and the mean arms conversion kit?
Dave on Jul 20, 2019
BEST ANSWER: Yes, I have this setup and the EndoMag conversion and it works great. You'll probably want to get a heavier buffer if don't already have one (like the FM-9).
Does this upper allow last round hold bolt open feature?
Dan on Oct 31, 2018
BEST ANSWER: Last round hold open is a feature found on the lower receiver.
Will this work with an ATI OMNI LOWER and ENDOMAGS?
Brad R on Jul 20, 2019
Does this barrel have a feed ramp?
Beat818 on Jul 18, 2019
BEST ANSWER: Yep, I used the PSA BCG to make sure there wasn't going to be any issues. Runs like a top.
Will this upper work on a Stag Model 9 lower?
Snowman on May 3, 2019
BEST ANSWER: If it is a mil spec lower it should work fine
Thunder tactical 80% 9 lowers work with no problems
Anyone shot this upper left handed? How’s the brass trajectory?
Alan D on Oct 18, 2019
BEST ANSWER: Yes i have shot it left handed pretty consistent ejection straight out, no problems with brass hitting me in the face.
Are these barrels rated for + P Ammo ?
Barry W on Aug 19, 2019
BEST ANSWER: Shouldn't be an issue. More of an issue of the recoil system which can handle much larger calibers that produce way more energy than even a +P or +P+ can produce. You'll be fine.
Will this completed upper fit silencers or is it too tight of a fit?
krisos s on Mar 26, 2019
BEST ANSWER: Inside diameter is 1.4”
will this fit a KE Arms 9mm billet lower?
Footie on Feb 23, 2019
BEST ANSWER: It will fit
This is a milspec upper with 9mm hardware,
Look at the KE Arms description and it will tell you if there are any modifications or if a special upper is needed.
I had to mill mine a little to accept MP5 magazines, it works great for Glock mags without any issues
Can the this upper be used on the px-9 lower?
Dustin J on Feb 15, 2019
What's the max diameter supressor would the handguard allow?
akathedevil on Dec 23, 2018
BEST ANSWER: Probably have to cut the handgaurd back there’s not enough room for suppressor
I have your ar15 multi. Do I need to purchase any other component other than the upper for completion?
martin m on Nov 22, 2018
BEST ANSWER: Since conventional 9mm mags will not fit into your regular mil spec lower, you will need to either get a magwell adapter that will allow your lower to accept 9mm mags(usually glock or volt mags). Or you can MEAN Arms Endomag Kit which allows you to convert regular Magpul Pmags so that they will accept 9mm ammunition. The Endomags are also LRBHO capable.
when will this upper be back in stock?
k k on Sep 13, 2019
What makes this Bolt Carrier Group a Hybrid / Gen 4 ? Compared to previous PSA BCGs ?
Michael J. on Dec 24, 2018
Does this work with the glock mag lower?
Austin H on Nov 25, 2018
Will this upper be an acceptable length, to fall into the 26” OAL,if the can is pinned to the barrel?
Josh T on Nov 13, 2018
Will this work with the Yankee Hill AR 9mm lower? The lower I have is set op for metalform mags.
David S on Oct 27, 2018


4.2 / 5.0
16 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
I absolutely recommend both products. The optic is such a steal for the money. Can’t beat it.
Looks great! Now I just need the damn lower to ship that I ordered back in July...smh
Looks great! Now I just need the damn lower to ship that I ordered back in July...smh
October 5, 2019
2 months ago
So much fun
I absolutely love it went with 8oz buffer And it runs like a dream like a laser pointer at 50 yd The only thing I see wrong is the bcg Black coating wears off way to quick Other than that it's so much fun I live in California I got a fake 6.6 suppressor Penned and welded Absolutely love it I can't believe how many people at my range has picked one up since I've shown them it
September 16, 2019
3 months ago
I was able to lob cheap range ammunition into a 3” group at 100 yards. Very happy.
Sub 2” group.  Outstanding accuracy.
Sub 2” group. Outstanding accuracy.
September 2, 2019
6 months ago
Excellent Upper
Excellent upper, have shot cheap ammo flawlessly with no malfunctions, very accurate!
User submitted image
Added Jun 26, 2019
June 26, 2019
5 months ago
This makes for an exceptionally nice AR pistol
I debated on which upper receiver to select for my AR pistol build. With a little bit of advice from the fellas at the Ridgeland store, I made the right selection.
Barrel length is perfect for a couple accessories and the AR is relatively “quiet” compared to other firearms.
I am very pleased with the build and fortunate to have access to the knowledge and experience of PSA staff members.
June 16, 2019
6 months ago
Well satisfied with product it is what they say it is
June 2, 2019
6 months ago
Not Worth the Money at all
It had a couple blemishes on the rail and had oil all over everything. Even worse then that is that the bolt carrier would NOT charge on any bullet. You would have to pull the charging handle back 4 or 5 times in order to get it to properly seat on the brass. And once it would finally charge it would hang up and not push the spent brass out without jamming on the next bullet. I tried numerous mags and two different style lowers and came to the conclusion it was the bolt carrier. After tearing the BCG apart and removing the gasket in it, it started working better. Still has the occasional mess up but it works decent.
May 25, 2019
6 months ago
Response from Palmetto State Armory
We do apologize for that. Please contact Customer Service so we may resolve this issue.
May 28, 2019
Casey S
Love it!
Purchased this for my pistol build. This is my 3d or 4th upper from PSA. Just like the rest, no issues with fitting or performance.
April 28, 2019
8 months ago
Shoots great and looks great will buy more psa
April 23, 2019
7 months ago
Not cool.
Not at all happy with this. The ejector arm was scratching into the BCG, leaving shavings in the lower receiver. Sent it in for warranty work to be done. They apparently tightened the buffer tube (which wasn’t loose to begin with) and then sent it back to me. I’m very disappointed but not terribly surprised.
April 17, 2019
8 months ago
Response from Palmetto State Armory
After reviewing you photos, we would like to have this brought back in to have a new ejector and bolt installed and test fired. We do apologize for that. Please contact Customer Service so we may resolve this issue.
April 30, 2019
Casey S

Customers Who Viewed This Item Also Viewed