Due to higher than average order volume, please expect shipping times to be delayed up to 10 business days. Please expect longer wait times for Serialized items (FFL required).
Due to higher than average order volume, please expect shipping times to be delayed up to 10 business days. Please expect longer wait times for Serialized items (FFL required).
PSA 8.5" Pistol-Length 300AAC 1/7 Nitride 10.5" Lightweight M-Lok Upper - With BCG & CH

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PSA 8.5" Pistol-Length 300AAC 1/7 Nitride 10.5" Lightweight M-Lok Upper - With BCG & CH


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.

WARNING: Handling firearms or firearms parts can expose you to lead and other petroleum products known to the State of California to cause cancer, birth defects, or other reproductive harm. Wash hands thoroughly after handling. For more information go to www.p65warnings.ca.gov (CA Health and Safety Code Section 25249.6).

SKU: 5165491140
UPC: 5165491140
MFR#: 5165491140

Barrel Length: 8.5"
Barrel Profile: Heavy
Gas System: Pistol-length
Barrel Steel: 4150V Chrome Moly Vanadium
Barrel Finish: Nitride
Chrome Lining: No
Muzzle Thread: 5/8x24
Chamber: 300AAC Blackout
Twist Rate: 1:7
Barrel Extension: M4
Diameter at Gas Block: .750
Gas Block Type: Low-profile
Muzzle Device: PSA Fluted Flash Can
Receiver Material: Forged 7075 T6
Receiver Type: M4
Handguard Type: PSA 10.5" Lightweight M-Lok Free Float Rail
Bolt Carrier Group Included: Yes
Bolt Steel: Carpenter 158
Bolt Carrier Profile: Full-Auto
Charging Handle Included: Yes

Add To:

Barrel: 8.5" 4150V Chrome Moly vanadium steel, nitride treated for durability and chambered in 300AAC Blackout with a 1 in 7" twist. Pistol-length gas barrel is finished off with a PSA 10.5" Lightweight M-Lok Rail, a low profile gas block and a PSA 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 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. 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.

Bolt Carrier Group: Bolt is made of Mil-spec shot-peened Carpenter 158 steel. Gas key is secured with grade 8 fasteners and staked per mil-spec.

SKU: 5165491140
SKU 5165491140
Brand Palmetto State Armory
Department Uppers
Daily Deal No
Daily Deal Expires No
Unit Price No
Youtube Video No
Free Shipping? No
Free Shipping Qty Label No
Free Shipping Qty No
SKU: 5165491140

Questions and Answers

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Browse 17 questions Browse 17 questions and 22 answers
What is the flash can diameter?
Stevo on Oct 12, 2019
BEST ANSWER: Both my 9mm and .22cal flash cans from PSA are 1 1/4" at the widest point.
Is the m-lok short enough to allow a suppressor?
Daniel L on Oct 11, 2019
BEST ANSWER: 8.5 barrel, 10.5 handguard. So 2" of hidden barrel for a smaller profile. If you can find a can skinny enough to fit under the handguard.
Does anyone know the internal dimensions on the rail or outer dimensions on the flash can?
Aaron Z on Oct 10, 2019
BEST ANSWER: My flash can measures 1 and 3/16", leaving just the smallest margin to fit into the 1 and 1/4" handguard opening.
I am very interested in ordering this upper in 300 blackout. I have a Silencerco Omega suppressor that measures 1.56 inches in diameter. Will this fit inside of the barrel shroud? As the barrel is only 8.5 inches and the barrel shroud is 10 inches.
Scott on Oct 25, 2019
BEST ANSWER: If it doesn't fit, go to Hughes Precision and order a threaded extension for it. They specialize in extensions for suppressors.
Will this fit an ar15 lower?
Tater on Oct 21, 2019
I assume the threading on the barrel is standard for a 300?
Frank H on Oct 11, 2019
BEST ANSWER: Says in description 5/8 - 24 This is usual on a .308 or 300 BO
What is the internal diameter of the handguard?
Fted J on Nov 2, 2019
BEST ANSWER: The handguard measures 1 and 1/4 inches inside. PER Barry R on Nov 30, 2019 IN OTHER QUESTION
Why will pea not list inside diameter of handrail, or outside diameter of flash can?
Mike W on Oct 30, 2019
BEST ANSWER: I believe the OD on the flash can is 1.2”. As long as it’s the same as the 5.56 flash can.
What is the overall length?
Hunter G on Oct 30, 2019
Is this available in 5.56?
Chad G on Oct 24, 2019
BEST ANSWER: Look below this listing page there in the customers who viewed this item also viewed.
Will this upper work with a carbine buffer or will I need one for a pistol?
John D on Oct 14, 2019
BEST ANSWER: Since 300 BO in NOT blowback, a standard carbine spring and buffer or an H3 style buffer are used.
Will a 1.360" Can fit inside?
TEXAS HOLDEM on Feb 14, 2020
BEST ANSWER: Flash can is 1 3/16 in diameter. No additional room for 1.36” or 1 5/16 in the handguard.
Will this upper cycle subsonic ammo without a can?
Wayne M on Oct 31, 2019
BEST ANSWER: Mine runs them just fine
Can the flash can unscrew be unscrew for a can?
Ray P on Oct 24, 2019
BEST ANSWER: When I look at the clearance between the inside of the handguard and the flash can, it doesn't appear like it could be removed without first removing the handguard. I wonder if that is the consensus from others.
Is this considered a pistol upper, or an SBR upper?
Thomas V on Oct 24, 2019
BEST ANSWER: Pistol length upper, less than 16" barrel. Could use with SBR registered lower if you have one that is registered and marked already
Overall length with brace fully extended?
Daireus T on Nov 11, 2019
Is this available without bcg and ch?
James D on Oct 25, 2019


4.5 / 5.0
24 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
I put it on my own 80% lower everything Went together great put about 500 rounds through flawless
March 21, 2020
2 months ago
Great quality. Nice grouping. Cleans up nice. Minimal copper fouling after first few shots.
March 16, 2020
2 months ago
Great Starting Point
First things first. For 299, its a great starting point. You’re getting a pretty stellar BCG, upper receiver and barrel. But thats about where it ends. The hand guard is super cheap in both feel and looks. It screams made in china, and anodized there too. The charging handle mimics that sentiment. The gas block also had the longest set screws known to man in it, and was an open ended design (most are closed on one end) wound up replacing the charging handle with an old BCM one i had laying around. Replaced the pot aluminum hand guard with a Strike Industries Strike Rail. And last but not least dimpled the barrel and changed the gas block and tube with a Spikes Tactical lo-pro and melonited gas tube. The hand guard MUST be changed if you plan on putting anything near the muzzle (in my case a hand stop) because the flash can is too large and close to the hand guard to allow anything to be attached. Like i said, all in all a great starting point. But expect to put a few dollars into it.

PS: runs like a top.
January 30, 2020
I love it. It runs great
January 27, 2020
4 months ago
Great upper
Locked straight into omni hybrid lower. Already put 300 rds through it with no issues. Would recommend.
User submitted image
Added Jan 21, 2020
January 21, 2020
4 months ago
Cod “Honey Badger”
Bought this as my first 300 blk chambered ar since I fell in love with the “Honey badger” from cod franchise and it does not disappoint. The flash can just perfectly pokes out of the tip so you know it’s there but not to much to seem like it’s just a screw on faux suppressor. Highly recommend for someone who wants the “Honey Badger” look. Or if your me, make your own “Honey Badger” with the “Trash Panda” lower.
January 4, 2020
4 months ago
Totally worth your business
Great purchase. I’m very satisfied with the 300BO! Glad I finally got one even though I should’a did this a long time ago. Great company and their shipping is on point in a well designed package! I use them all the time!
December 31, 2019
5 months ago
I like it !
It would not cycle at first but it’s probably my fault ? I maybe didn’t lube it enough around the BCG ! After the second hold up it ran fine !
December 26, 2019
5 months ago
Just see for yourself!
300 blackout build from PSA
Worth every penny!
Worth every penny!
December 26, 2019
5 months ago
Very solid, biggest complaint would be the clearance with the mlok fasteners with the gas block & flash can
December 25, 2019
5 months ago

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