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PSA 10.5" Pistol-Length 300AAC 1/8 Phosphate 9" Lightweight M-Lok Upper - With BCG & CH - 5165448418


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: 5165448418
UPC: 5165448418
MFR#: 5165448418

Barrel Length: 10.5"
Barrel Profile: A2
Barrel Steel: Chrome Moly Vanadium
Barrel Finish: Phosphate 
Chrome Lining: No
Muzzle Thread: 5/8-24
Chamber: 300 AAC Blackout
Twist Rate: 1:8
Barrel Extension: M4
Diameter at Gas Block: .750
Gas Block Type: Low-profile
Muzzle Device: A2 Style Flash Hider
Receiver Material: Forged 7075 T6
Receiver Type: A3
Handguard Type: Lightweight M-Lok 9" Free Float Rail
Bolt Carrier Group Included: Yes
Bolt Steel: Carpenter 158
Bolt Carrier Profile: Full-auto
Charging Handle Included: Yes
Overall Length: 19.5"

Add To:

Barrel:  10.5" Chrome Moly vanadium steel, phosphate coated and chambered in 300AAC Blackout with a 1 in 8" twist rate. pistol-length gas barrel is finished off with a PSA 9" Lightweight M-Lok Rail, a low profile gas block and an A2 Style Flash hider. 

Upper: Forged 7075-T6 A3 AR upper is made to MIL-SPECS and hard coat anodized black for durability. These uppers are made for us right here in the USA by a mil-spec manufacturer. 

Bolt: Bolt is made of Mil-spec shot-peened Carpenter 158 steel. Gas key is secured with grade 8 fasteners and staked per mil-spec. Bolt carrier is parkerized outside, and chrome lined inside.

SKU: 5165448418
SKU 5165448418
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: 5165448418

Questions and Answers

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Browse 7 questions Browse 7 questions and 18 answers
can the flash suppressor be removed and a silencer be installed?
Brian D on May 19, 2018
BEST ANSWER: Yes. Use a 5/8-24 thread adapter - per description. (plus NFA stamp)
Is this a complete upper? So if I purchase a complete lower it would be a complete AR?
Damian on Mar 15, 2019
BEST ANSWER: Yes this is a complete upper all you need is some sort of sighting system to finish it off. Get their complete lower and you have a great pistol or SBR.
Can this be ordered with an adjustable gas block?
Kevin on May 19, 2018
BEST ANSWER: this upper only comes with a standard low profile gas block.
What is the inner diameter of the hand guard?
Austin C on Jun 7, 2018
Is the barrel an H-Bar?
Brian R on May 21, 2018
BEST ANSWER: this barrel has an .850" diameter behind gas block.
do i need some kind if stamp for this? i will buy the pistol lower too.
goldo787 on May 25, 2018
BEST ANSWER: No, as long as you are not mounting a physical buttock onto the lower.
Any reputable brace is also allowable via referencing ATF guidelines
Any recommendations for completed lower that would fit best ? I just ordered this upper
Damian on Mar 16, 2019


4.7 / 5.0
33 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
300 Blackout beast.
I am always impressed with everything from PSA and this build is no exception. Accurate and 100% reliability with both supersonic and subsonic ammo. Thank you Palmetto for a great weapon and service.
Paintball gun quiet with 220 grain subsonic Remington and 100% reliability.
Great 300 Blackout build! High quality as always. Palmetto always impresses.
User submitted image
May 30, 2019
3 months ago
I got a lemon
So far I am not pleased with the complete upper. I’ve had to send it back twice. Customer service is great, but it’s still frustrating having an upper that doesn’t work. The rail was slightly damaged when I first bought it but PSA gave me a blemish credit. They told me they’ve replaced the upper assembly this time. Let’s hope it works. I’m asking for a refund next time. Very disappointed with this purchase.
May 23, 2019
3 months ago
Great way to get into .300 blackout!
Runs great, for the price you cannot complain.
The Bolt Carrier Group is not the highest quality but has and expect it will perform well for the foreseeable future.
The handguard was loose but was easily tightened.
I didn't run it with the a2 bird cage opting instead for a noveske kx3.
With the kx3 it will run hornady subsonics.
Overall a good purchase. I would buy again.
Magbul buis
Noveske KX3
Vortex Sparc 1st gen.

On an Aero precision M4A3 lower.
With; Magbul buis Noveske KX3 Vortex Sparc 1st gen. On an Aero precision M4A3 lower.
May 6, 2019
3 months ago
Made into a great defensive weapon for my wife.
May 5, 2019
3 months ago
Good product and good value.
Nice upper works well. I put 4 stars because I like to pin the gas block, and dimple the gas block set screws' spots on the barrel, then Rocksett them in place(more like a milspec pin and such). I also replaced the handguard with a better BCM quad rail, which is anti rotation with tabs and anti sliding(axial movement) with bolts that fall into a slot in the barrel nut. Just extra stuff I like to do which is more milspec or tougher. Good accuracy and function, though. Supersonic 125 grain approximate weight 300 Blackout ammunition used.
May 5, 2019
3 months ago
Fun build, everything fit perfectly and shoots great!
May 4, 2019
3 months ago
Got it pretty fast and it fits right into my Anderson lower i already had built haven’t fired it yet but everything was great look and feel. Can’t wait to fire it
May 3, 2019
3 months ago
Great Value and Accuracy. Gas too short for Super Sonic
Very well balanced and the QD hole is great for handling.
I bought earlier model without QD hole.

Accuracy is very good and can put hole into hole with a cheap red dot at 10-25 meters.
BUT the pistol gas system on ALL 300 BLK from PSA means the extraction will happen before the chamber pressure drops to safe level the the brass shrinks again to come loose.
Over gassing the system will tear the cartridge rim and pop out primers that will jam the bolt. Adjustable gas block or heavier H3 buffer will NOT HELP.
Use ONLY SUB SONIC ammo speed or Super Sonic well below 2,000 fps.
March 19, 2019
300 blackout 10.5 upper
looks and works great love the m-lock hand guard mated it to an aero stripped lower first time at range it shot 1.75 in groups at 50 yards
January 21, 2019
7 months ago
Great upper for my 300AAC Blackout build!
This is a great value upper for my build. Put everything together and was shooting <1” 3-shot groups at 115 yards with junk factory ammo!
December 28, 2018
7 months ago

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