PSA Gen4 4" 9mm 1/10 GX M-Lok MOE EPT Shockwave Pistol - 5165450018

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PSA Gen4 4" 9mm 1/10 GX M-Lok MOE EPT Shockwave Pistol - 5165450018


Quick Overview

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

Must be 21 or older to purchase.

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

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: 5165450018
UPC: 5165450018
MFR#: 5165450018

Barrel Length: 4"
Barrel Profile: Heavy
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, Blowback
Muzzle Device: PSA Fluted Flash Can
Receiver Material: Billet 7075 T6 Aluminum
Receiver Type: Slick Side 
Handguard Type: PSA 5" Lightweight M-lok Rail
Bolt Included: Yes 
Bolt Steel: 8620, Nitride / Heat Treated 
Lower Receiver Material: Forged 7075 T-6 Aluminum
Lower Receiver Finish: Hard Coat Anodized, Black
Fire Control Group: PSA Enhanced Polished Trigger (EPT)
Grip: Magpul MOE Pistol Grip, Black
Stock: KAK Industries Shockwave Blade
Buffer Tube: KAK Industries Pistol Buffer Tube 
Magazine: ETS 31rd Glock Magazine

Add To:

Barrel: 4" chrome moly vanadium steel barrel. Chambered in 9mm (9x19), with a 1/10 twist rate. The barrel is nitride treated for durability and finished off with a PSA 5" Lightweight M-Lok Rail, and a PSA Fluted Flash Can muzzle device.

Upper: Newly designed billet 6061-T6 slick side upper is hard coat anodized black for durability.  Featuring T-marks, these upper receivers are made for us right here in the USA.

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

Flash Can: Palmetto State Armory's new 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.

Lower: Forged 7075 T6 aluminum and then hard coat anodized, these lowers are purpose-built to accept 9mm Glock®-style magazines. Designed to work with PSA's new 9mm Hybrid uppers.  The lower is assembled with a Palmetto State Armory MOE lower build kit with a Magpul Grip, PSA Enhanced Polished Trigger, KAK Industries Pistol Buffer Tube, and KAK Industries Pistol Stabilizing Blade.  Does not include last round bolt hold open feature.

SKU: 5165450018
SKU 5165450018
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: 5165450018

Questions and Answers

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Browse 33 questions Browse 33 questions and 29 answers
Why does this not have the last round bold hold-open? Is last round hold-open available on an AR-9 that uses Glock mags?
Jim H on Nov 2, 2018
BEST ANSWER: PSA used to sell LRBHO AR-9's but I believe there were problems with them so they stopped selling them. My recommendation is to look into FM Products 9MM lowers. They are reasonably priced and have LRBHO. They also work with PSA 9MM uppers.
Will standard AR trigger group drop in 9m lower receiver?
Bob A on Nov 2, 2018
BEST ANSWER: Yes, all of my AR-9 lower receivers have mil-spec or higher end (Geissele/Hiperfire) triggers in them.
What is the over all length on this?
Charles A on Nov 4, 2018
BEST ANSWER: Fully collapsed and with the brace secured to the tube it measures at 20 5/8”.
Fully extended and with the brace secured to the tube it measures at 24 1/16”.
Does the flash can come off? I’ve been trying to unscrew it and it won’t budge.
Logan on Nov 14, 2018
BEST ANSWER: Yes. Use 2 adjustable wrenches.
Will a ptp ranger suppressor fit the muzzle?
Jeff M on Nov 2, 2018
BEST ANSWER: With the brake removed and the proper thread pitch FIXED Barrel adapter it should. If you get the Flash Can removed send Pictures and info to Josh on Face Book PM or via the website contact. I shoot for them and work with them when they are busy. JM
I see this AR-9 in a similar build except it has a "Billet 7075 T-6 Aluminum" lower. Is there a "better" lower then the other, advantages / disadvantages....likes n dislikes? And a recommended Red Dot optic for this if you can. Thanks.
TexasTP75 on Feb 1, 2019
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Does anyone know the unloaded weight including mag?
David L on Jan 16, 2019
Can I put a binary trigger from Franklin Armory in this?
Jeffrey M on Jan 16, 2019
Does this have to be shipped to a ffl?
Jay S on Nov 6, 2018
Does the Law Tactical folding stock adapter work on this platform?
Adam P on Nov 27, 2018
BEST ANSWER: yes it will.....
How do I attach mlok attachments to this hand guard? The flash can will not allow it...
Matthew P on Nov 11, 2018
BEST ANSWER: I had that problem trying to add an angle grip on the forward srcrew . I was able to add some washers under the head of the screw effectively shortening the threads .
This solved my problem , I hope it helps you.
Can you ship this to Maryland with 10 round magazines instead of the 31 round magazine?
Greg S on Nov 4, 2018
Does it take any full size glock 9 mag?
Roger B on Feb 8, 2019
What is the inside diameter (ID) of this handguard? Wanting to see if my can will fit or if I have to get the 8" version. ~thx
EricX on Nov 10, 2018
BEST ANSWER: The outside diameter (OD) of the flash can is 1 3/16" (2.9 cm or between 2.9 and 3 cm). I would say there's a 1/32" gap between the inside diameter (ID) of the handguard and the OD of the flash can.
What is the overall length?
Mark S on Nov 4, 2018
BEST ANSWER: Fully collapsed and with the brace secured to the tube it measures at 20 5/8”.
Fully extended and with the brace secured to the tube it measures at 24 1/16”.
Is the barrel easy to change? I have been looking at these for a few days, and wanted the 8 inch, but they are now out of stock. Will get the 4 and replace with an 8 later if they are easy to change.
Beezer on Feb 2, 2019
Do you need the buffer tube, or could you remove it and replace it with a folding or collapsible arm brace like the CZ Scorpion EVO 3 S2 Micro?
Alex B on Apr 30, 2019
BEST ANSWER: It’s a regular AR style system. You need the buffer tube. There is a spring and buffer in there.
Can this be shouldered considering it has the shockwave blade? Or is it still a no no by the ATF
Derrik B on Jun 1, 2019
BEST ANSWER: short answer: it can be shouldered
Long answer: look up ATF ruling on shouldering pistol brace
Is this classified as a SBR or only a pistol CCW permit?
Stephen J on Nov 2, 2018
BEST ANSWER: It has a shockwave pistol brace, so it is classified as a pistol. As far as needing a conceal carry permit to keep it on you in a bag or in your car, it would depend on your local laws.
Anyone shoot self defense hollow points in this ?
mojobama on Mar 19, 2019
BEST ANSWER: I have yet to shoot any hollow points through it. However I have yet to have a feeding issue. About 1000 rounds down range. I did buy Glock mags for it, for aesthetic reasons . I would suggest polishing the feed ramp for hollow points however.
It’s a fun shoot and I’ve enjoyed upgrading it as well!
Have fun!!
Can you change the buffer tube for a mil-spec buffer tube?
Mason on Feb 14, 2019
Can an SB Tactical SBA3 brace be added to this pistol without making it an SBR?
Steven O on Jan 29, 2019
BEST ANSWER: Yes it's a pistol brace therefore it's still a pistol
Does it come with mag also or I have to buy that what about the barrel?
Jacquez T on Jan 25, 2019
BEST ANSWER: It comes as pictured -ready to go with mag. I don’t care for those see thru style mags but they work fine.
Is this legal in CA?
Jose L on Dec 1, 2018
BEST ANSWER: You need to give Nancy a call to be sure but with the pictured magazine , I would say NO
Is the Mag release button aluminum or still plastic?
Rrotz on Nov 7, 2018
BEST ANSWER: It's aluminum.
Just recieved this gun I've noticed non extended and extended I'm gonna probably need some high sights to aim down the barrel. Any recommendations? I've been thinking folding iron sights but could tempt the idea of a red dot.
Matt D on May 8, 2019
Is this CA legal?...I'm so confused on the rules these days. :/
Wade H on May 6, 2019


4.8 / 5.0
12 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Nothing Hidden
4.5 inch barrel. I am skeptical about mail order anything one can't try on. I knew the down sides claims before I bought like last round open. Ok that takes a little getting used to but the good stuff, THIS LITTLE GUY IS AWESOME. Can not tell you after 100 yds but anything between-dead on. Shoot slow, shoot fast, 115gr to 147gr no prob. Thanks PSA, great firearm, reasonable price.
May 30, 2019
Nice gun
Nice gun. Just mounted a sig romeo5 to it. A little bummed, wanted the 8 inch barrel, waited and waited, didn't come back in stock soni bought the 4 and a week later the 8 is back in stock.
March 7, 2019
4 months ago
Very nice weapon ! Pairs up nicely with my Glock 17 !
Works very well ! Love it it pairs up nicely with my Glock 17
Works very well ! Love it it pairs up nicely with my Glock 17
March 5, 2019
4 months ago
WOW! Another Shooter
I am very pleased with the PSA Gen4 4" 9mm. I have had ZERO malfunctions after 500rds of 9mm ball ammo. Every single Glock magazine (30 of them) worked flawlessly! I could not be happier. Thank You Palmetto.
February 25, 2019
4 months ago
Ready 2 rock
Build quality is great.
Haven't shot it yet....but I got it set up and ready 2 go!
Haven't shot it yet....but I got it set up and ready 2 go!
February 23, 2019
4 months ago
Sent back as soon as it I got it out of the box
First, fit and finish looked good. I watched a lot of YouTube videos of guys impressed by this pistol and I expect most of them to be that good. Mine was most likely an anomaly. She wouldn’t insert a magazine unless you depressed the release first, and the release itself would catch in the open position 7 of 10 attempts. PSA was quick with a UPS return label and I’m waiting on a repaired/replaced pistol so that I may regale you with tales of how good it is as I expect it to be exactly that.
February 16, 2019
5 months ago
Haven't shot yet but I thought I might add/warn
The flashtube makes it hard to add rail items. You just gotta take it off to add anything on the bottom or sides. Just a heads up but I like the tight clearance!
February 16, 2019
4 months ago
First 50 rounds
Really like this pistol, the provided ETS mag. follower jammed up and caused a non-feeding issue, but pistol is great.
February 2, 2019
Great AR pistol
this gun is very well made and everything fits tight. I put a heavy coat of oil on it first trip to the range and shot 100 rounds from several different size mags without any issues at all.
I highly recommend this firearm. It’s fun to shoot too.
January 30, 2019
Perfect truck gun!!!!!!
Man this thing is awesome. perfect truck gun that runs flawlessly
January 24, 2019

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