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

In stock

Regular Price: $ 519.99

Special Price $ 369.99

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.

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? Yes
SKU: 5165447571

Questions and Answers

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Browse 3 questions Browse 3 questions and 13 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.
So is the flash can removable?
Cj B on Jul 7, 2018
BEST ANSWER: Yes, it is removable. It’s a pistol so they don’t pin and weld like they would for a rifle of shorter length. You would have to remove the hand guard to be able to remove it though
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.


4.7 / 5.0
21 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
PSA 10.5 300 BO upper with PSA SBA3 Pistol kit
Wow...overall good quality, upper was perfect but the lower kit had a bad mag catch bar (would not retain a P-mag) had to remove and modify before it would function. EPT trigger it great but I did use JP replacement springs. Thank for the fast shipping, I can deal with one out of spec part.
Complete build with PSA SBA3 pistol lower kit installed on a Billet EDC lower & PSA 300 BO upper.
Complete build with PSA SBA3 pistol lower kit installed on a Billet EDC lower & PSA 300 BO upper.
August 12, 2018
1 week ago
Response from Palmetto State Armory
We do apologize for that. Please contact Customer Service so we may resolve this issue.
August 13, 2018
Casey S
Very nice upper, fit like a glove, no rattled and looks great. I would definitely recommend the PSA products!
August 1, 2018
1 month ago
Good price, good upper, good shipping
The upper shipped pretty fast and looks good. It came with the actual Magpul MBUS sights, not knock-offs, and so far I have only shot a couple hundred rounds through it, but I have no issues so far. The M-lok front hand rail is held by 2 pinch bolts, and after the first time shooting, it did loosen up and move forward. I just reset it and tightened it back up and shot another 112 rounds and it stayed in place, so I will just keep an eye on that. This isn't my first PSA purchase and it won't be my last. Good company. Thanks.
July 21, 2018
2 months ago
Great shooting but rusty gas block
It was ok. It shoots good but had some blemishes that are noticeable including a rusted gas block.
July 20, 2018
2 months ago
Response from Palmetto State Armory
We do apologize for that. Please contact Customer Service so we may resolve this issue.
July 23, 2018
Casey S
Wonderful purchase...
Awesome purchase...will be purchasing future products.
July 20, 2018
2 months ago
Ok upper but ....
I found that the gas block screws was not completely set. The hand guard can rotate out of alinement after about 30 rounds.
July 5, 2018
2 months ago
I wouldn't hesitate to buy again. 😎 Just saying.
Right so, I'm a fan of PSA & have been running their gear for a few years now. Once my slush fund is built back up I'm going to do this again. I didn't like the look of the 9" so I went with the 12" rail and gave it a trim. ** For you can lovers you will either need to trim or buy the 9", this is a lowpro rail. ** Since the TLC I've put a few hundred rounds (supersonic & subsonic - W & W/O a can) through her just to ensure that she runs great. Which of course she does.
Trim job w/can.
Trim job w/muzzle device.  Trim @ the centerline of the 1st bar equal with the base of the threads.
July 2, 2018
2 months ago
Great deal!
Works flawlessly, installed sights and never even had to adjust them, they are right on the money.
User submitted image
Added Jun 15, 2018
June 15, 2018
3 months ago
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
4 months 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
4 months ago

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