PSA 10.5" Pistol-Length 300AAC 1/8 12" M-lok Slant Upper - With BCG, CH, And MBUS Sight Set - 5165447571

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PSA 10.5" Pistol-Length 300AAC 1/8 12" M-lok Slant Upper - With BCG, CH, And MBUS Sight Set - 5165447571


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.

SKU: 5165447571
UPC: 5165447571
MFR#: 5165447571
  • Barrel Length: 10.5"
  • Barrel Profile: Heavy
  • Gas System: Pistol-length
  • Barrel Steel: 4150V Chrome Moly Vanadium
  • Barrel Finish: Phosphate
  • Chrome Lining: No
  • Muzzle Thread: 5/8x24
  • Chamber: 300AAC Blackout
  • Twist Rate: 1:8
  • Barrel Extension: M4
  • Diameter at Gas Block: .750
  • Gas Block Type: Low-profile
  • Muzzle Device: Palmetto State Armory Fluted Flash Can
  • Receiver Material: Forged 7075 T6
  • Receiver Type: M4
  • Hand guard Type: PSA 12" Slant End M-Lok Rail
  • Bolt Carrier Group Included: Yes
  • Bolt Steel: Carpenter 158
  • Bolt Carrier Profile: Full-Auto
  • Charging Handle included: Yes
  • Includes: Magpul MBUS Sight Set, Black
  • Overall Length: 21"
  • Weight as configured: 4 lbs

Add To:

Barrel: 10.5" 4150V Chrome Moly vanadium steel barrel phosphate coated and chambered in 300AAC Blackout with a 1 in 8" twist. Pistol-length gas barrel is finished off with a PSA 12" Slant End M-lok Rail, a low profile gas block and a Palmetto State State Armory Fluted Flash Can.

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

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 5/8x24 for 300AAC Blackout. Black mil-spec 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 GroupFull-auto profile bolt carrier group. Milspec Carpenter No. 158® steel bolt, Shot Peened, High pressure tested, Mag particle inspected, Gas Key Hardened to USGI Specifications, Fastened with Grade 8 screws, and Staked Per Mil-Spec. 8620 steel M-16 profile carrier is chrome lined and phosphate coated.  

Includes: Magpul MBUS Sight Set, Black

SKU: 5165447571
SKU 5165447571
Brand Palmetto State Armory
Daily Deal No
Daily Deal Expires No
Youtube Video No
Free Shipping? No
SKU: 5165447571

Questions and Answers

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Browse 2 questions Browse 2 questions and 7 answers
Will a suppressor fit under this handguard?
Keith E on Apr 26, 2018
BEST ANSWER: I have this upper combo and the flash can is approx 1-3/16” od having an approx 1/16” gap all the way around that to the handguard. Without taking the flash can off I would be comfortable in saying there is a 1-5/16” inside diameter to the handguard. If your suppressor has a 1-3/16” outside dia. (or smaller) it should fit nicely.
Does the uppers ship to your home address?
Joseph B on Apr 27, 2018
BEST ANSWER: Yes this will ship to your home address. No FFL required.


4.9 / 5.0
13 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Awesome pistol build!
Fantastic build by PSA. It functions smoothly, the machining and components are high quality, very well made, and it is very accurate. I zeroed it with 6 shots and It could drive a nail head in at 50 yards no problem. I'm super impressed and it immediately became my favorite weapon in my collection so far. I didnt give it 5 stars because the dust cover wouldn't close unless I put my fingernail in there and depressed the plunger. Easy fix but that was the only issue out of the box.
May 10, 2018
1 month ago
Love this product it’s put together nice good fit on the rail would definitely recommend to a friend the service was fast and packaged well
User submitted image
Added May 8, 2018
May 9, 2018
1 month ago
300 Blackout 10.5
Exceeded my expectations THANKS.
300 blackout upper exceeded my expectations far prices THANKS
300 blackout upper exceeded my expectations far prices THANKS
May 7, 2018
1 month ago
I like it it's pretty nice.
May 7, 2018
1 month ago
High quality and a personal touch.
PSA is great to work with. Easy ordering. Short shipping times. Had to call and change FFLs and the young lady made it very easy.
The ammo didn’t come with it but everything was packaged very well.
All put together! Bought the pistol lower through PSA as well. Sig Romeo 5 to top it off.
May 6, 2018
1 month ago
The Made in the USA stamp on it was one of the best things. I took it out to the range and fired umc 120 gr. Super Sonics without a problem, overall quality is good would recommend.
May 5, 2018
1 month ago
Beautiful for the money
Seems to be quality material, haven't had a chance to shoot it yet nothing was loose or scratched psa did a great job here! And it actually comes with real mbus flip up sights not knockoffs. Total must buy! I will be buying the pistol lower from psa as well!
May 4, 2018
Great upper!
Great upper, runs flawless even when shooting subsonic. Getting about 1.75 MOA with handloads. Rail is solid and sturdy. Great upper for the price. Fits my pistol lower perfectly.
Great upper! Runs great, even shooting subsonic ammo. 1.75" MOA accuracy for a 10.5"
Great upper! Runs great, even shooting subsonic ammo. 1.75" MOA accuracy for a 10.5"
May 3, 2018
1 month ago
Absolutely LOVE IT!
This is the ideal platform for me!
May 3, 2018
1 month ago
Nice shoot
Hand guard was loose make sure you double check it.

Amazing upper
May 2, 2018
1 month ago

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