PSA 4" 9mm 1/10 PA-9 M-Lok MOE Shockwave Pistol, Black - 5165447903

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PSA 4" 9mm 1/10 PA-9 M-Lok MOE Shockwave Pistol, Black - 5165447903


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.

SKU: 5165447903
UPC: 5165447903
MFR#: 5165447903
  • Barrel Length: 4"
  • Gas System: Blowback
  • Barrel Profile: Heavy
  • Barrel Steel: 4150V Chrome Moly Steel
  • Barrel Finish: Nitride
  • Chrome Lining: None
  • Muzzle Thread: 1/2-36
  • Chamber: 9mm (9x19)
  • Twist Rate: 1 in 10"
  • Barrel Extension: Blowback
  • Diameter at Gas Block: N/A
  • Gas Block Type: N/A
  • Muzzle Device: PSA Fluted 9mm Flash Can
  • Receiver Material: Forged 7075 T6
  • Receiver Type: M4
  • Handguard Type: PSA 6" M-Lok
  • Bolt Carrier Group Included: Yes
  • Bolt Steel: 8620
  • Bolt Carrier Profile: 9mm Hybrid
  • Charging Handle Included: Yes
  • Lower Receiver: Forged 7075 T6 Aluminum
  • Receiver Finish: Hardcoat Anodized
  • Fire Control Group: Single-Stage, Mil-spec style
  • Grip: Magpul, Black
  • Buffer Tube: 7075 T6 Aluminum 
  • Adjustment: Fixed
  • Pistol Brace: KAK Industries Pistol Stabilizing Blade, Black
  • Magazine: ETS Clear Magazine, 31 Round

Add To:

Barrel: 4" 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 6" M-Lok free-float rail and a Palmetto State Armory Fluted 9mm Flash Can.

Flash Can: Palmetto State Armory's 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.

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

Bolt Carrier Group: G-9 Hybrid 9mm BCG. Phosphate coated, 8620 steel, G-9 Hybrid Bolt allows use with either Glock®-style, or Colt®-style magazine, Palmetto State Armory lowers. Includes charging handle.

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 pistol lower build kit with a Magpul Grip,  PSA pistol buffer tube, and KAK Industries Pistol Stabilizing Blade.  Does not include last round bolt hold open feature.

SKU: 5165447903
SKU 5165447903
Brand Palmetto State Armory
Daily Deal No
Daily Deal Expires No
Youtube Video No
Free Shipping? Yes
SKU: 5165447903

Questions and Answers

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Browse 1 question Browse 1 question and 2 answers
regarding the AR-9 PSA-4; what is the inside diameter of the handguard?
need to know for suppressor installation.
Brian P on Jun 11, 2018
BEST ANSWER: Very Tight!


4.8 / 5.0
8 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Well made
I really like the gun, shoots well with the Echo trigger installed.
July 15, 2018
1 month ago
Definitely worth the price. Glad I made the purchase. Will plan on 2 more!
Had to break it in. First couple rounds had failure to feed. But after we were able to rack the first round in…it started performing wonderfully. Lot of fun to shoot. Like the fact that it has a push assist and dust cover. The 10.5" model we purchased has neither. Will sell that and use towards picking up 2 more of these 4" when available for each of my adult kids. Never used the mags that came up with the purchase... Purchased a OEM Glock 33 round mag.
July 13, 2018
1 month ago
Good Deal. Blems on a non blem upper
This is my second PSA AR9. Fun gun, haven't had any issues with my first one.

The new one i just received had more blemishes on it then two "blem" uppers I've gotten from PSA in the past. For a non blem gun it looks like it had backup sights and an optic mounted on it at some point. The rail shows screw marks. Other than that the gun looks great. The magazine is a little tight in the well but, that's the mag not the gun.
User submitted image
User submitted image
User submitted image
June 20, 2018
Response from Palmetto State Armory
We apologize for that. Please contact customer service so we may correct this issue.
June 21, 2018
Casey S
Great deall
bought this on a daily special at a great deal. Have since purchased an 8 inch barrel t get a little more velocity out of it. Even with the cost of the extra barrel figured in, it was still a good deal.
May 5, 2018
3 months ago
Great Value
350 rounds with no issues. Using Glock magazines and the "50 round drum". Using a Vortex Sparc AR red dot makes this unit a lot of fun. No complaints or regrets. Unit had no blemishes, looked perfect.
April 29, 2018
4 months ago
So far, so good
I've run 300 rounds thru it of both good and cheap ammo and so far it has functioned flawlessly.
April 28, 2018
4 months ago
I wish I’d bought it sooner
I love this thing. Had a little trouble getting a consistent grouping at first while trying to get it zeroed, but now that that’s sorted I don’t want to shoot anything else.
Sparq AR red dot and TLR-1s on the rail
Sparq AR red dot and TLR-1s on the rail
April 27, 2018
4 months ago
Great pistol carbine at the price!
Great pisto carbine, thanks Palmetto.
April 25, 2018
4 months ago

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