PSA PA-9 Gen4 10.5" 9mm 1/10 Nitride 12" Slanted M-Lok Railed Upper With BCG & CH - 5165450304

More Views

PSA PA-9 Gen4 10.5" 9mm 1/10 Nitride 12" Slanted M-Lok Railed Upper With BCG & CH - 5165450304

In stock

Regular Price: $ 429.99

Special Price $ 329.99

Quick Overview

free shipping Free Shipping applies to this item only and not the entire order.

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: 5165450304
UPC: 5165450304
MFR#: 5165450304

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: 5165450304
SKU 5165450304
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: 5165450304

Questions and Answers

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 14 questions Browse 14 questions and 16 answers
Will this work w a New Frontier armory c-9 9mm glock lower?
Todd L on Jan 21, 2019
What is the inner diameter of the hand guard for installing a suppressor?
David E on Feb 21, 2019
BEST ANSWER: Keep in mind that the inside of the guard is not actually "round", the bottom and both sides have flat edges. I measured it as 1-3/8" across the flats at the sides, which is the narrowest part. My smallest diameter 9mm suppressor is 1-/12", so I had to use a 2" long barrel extension to mount the can. I hope this helps.
Will I need a heavier buffer to run this on ar15 pistol lower?. Just ordered the stern defense adapter.
Tater on Jan 31, 2019
Will this mount to a standard AR-15 pistol lower? I have a current 5.56 pistol lower, and would be nice to be able to swap uppers w/out building a new lower.
John C on Jan 11, 2019
BEST ANSWER: Yes but you will also need a mag conversion block for Colt or Glock mags. Or MEAN Arms Endo mags which are pretty cool. Converts Pmags to 9mm with integrated ejector, and lrbho works too.
Will this work with the 5Dtactical 80% 9mm Lower?
Paul on Jan 7, 2019
BEST ANSWER: More then likely. I built my gen 4 with 8" barrel on an 80% Arms 9mm lower
Will this upper function correctly with a Franklin armory binary trigger?
Michael C on Apr 8, 2019
Can anyone point or give me the sku number to the correct lower for this?
Oscar Alexandre on Jan 22, 2019
BEST ANSWER: Will work with any AR15 Pistol lower with a magazine block adapter, or put it on one of the dedicated Glock or Colt Pistol lowers. Just don't put it on a rifle lower without a tax stamp.
Will this upper work with the Mean Arms Endomag conversion kits for Pmags gen 2-3? I have consider this if this upper would work with these mags reliable function.
Jesse S on Jun 23, 2019
BEST ANSWER: I didn't like the look of dedicated 9mm or 45 acp lowers because of the small pistol magazines. As soon as I found MEAN Arms I put together a Matrix lower with this upper and two of the Endomags. I've put close to 1000 rounds through it with zero issues using brass and steel cased ammo. I also recommend running a heavy buffer, I am running a Kaw Valley Precision Blowback PCC Heavy Tungsten Buffer 7.5oz. Hope this helps!
What is the internal diameter of the rail?
Maxwell C on Jun 24, 2019
BEST ANSWER: I don’t know this item was added to my order twice. However I didn’t order it.
Will this fit on a spikes tactical 9mm Glock lower?
Mike S on Apr 25, 2019
BEST ANSWER: The bolt is compatible according to Palmeto. I have friends that use it on colt style as well as glock. It works fine whit the m92 conversion I have.
10.5 it’s considered pistol right?
XxGalantxX G on Apr 30, 2019
BEST ANSWER: Its a pistol only if you have a pistol brace with it. Otherwise it’s a SBR.
Is this handguard/rail a MidWest Industries?
Todd M on May 1, 2019
Is this a MidWest Industries rail/handguard?
Todd M on May 1, 2019
I have a PSA GX-9 MULTI lower... whats the right upper for it? is it this style? trying to get the lines to line up from my lower to a PSA upper. Thanks
gatlin j on Apr 19, 2019


5.0 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Has been flawless so far
Great price and quality.
Paired it with a AAO 80% lower with LRBHO. Both have been flawless, couldn't be happier!
Mounted cheap reflex sight while waiting for my Vortex.
Mounted cheap reflex sight while waiting for my Vortex.
June 11, 2019
2 months ago
Fun 9mm upper, minor ammo compatibility issue for me.
Mated this upper to a Ruger lower with a PSA EPT trigger group and JP JPS3.5T trigger spring kit (trigger group came from a PSA build kit, paid $10 for the springs -- quite a nice result for the price, IMO). Using a GUNTEC AR9 8oz buffer and spring along with a SBA3 brace.

Fit and finish on the completed upper are perfectly acceptable for the price. There is a slight finish difference between the receiver and hand guard, but doesn't bother me. Minimal wobble when pinned to a lower (also tested in Anderson & Aero lowers).

The bolt sounded a bit rough when cycling manually, but I would expect this to polish out over time. Did not seem to affect function during my initial range trip.

Put a few hundred rounds of various ammo through it. Only ammo it didn't like was Armscor 9mm 115gr FMJ. Had numerous rounds fail to go into battery (stuck half-way in the chamber), FTE, otherwise just miserable with this particular ammo (shot the same ammo, including rounds that failed in this upper, through various pistols the same day without issue *shrug*). Any other ammo I threw at it worked just fine (Federal brass, Blazer brass, bulk Winchester WB, etc.). Was using EndoMag PMAG conversions which also worked perfectly with the upper.

Groups at 15 yards were one ragged hole, no matter the ammo. At 30 yards groups opened up a little, but I'm also no master marksman (shooting off hand with a red dot at an indoor range). Plenty accurate for me and fun as hell (the most important part)!
May 1, 2019
2 months ago
PSA does it again!!!
Have around 500 rounds through it now with no problems. Great company and product. Worked well with 80% arms lower. Highly recommended!!!!!!
User submitted image
Added Feb 10, 2019
February 10, 2019
5 months ago
Perfect! Fit and finish is great. No issues. Runs flawlessly.
January 20, 2019

Customers Who Viewed This Item Also Viewed