PSA 8.5" Pistol-length 300AAC Blackout 1/8 Phosphate 7" Lightweight M-Lok Upper With BCG & CH - 5165449132

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PSA 8.5" Pistol-length 300AAC Blackout 1/8 Phosphate 7" Lightweight M-Lok Upper With BCG & CH - 5165449132


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: 5165449132
UPC: 5165449132
MFR#: 5165449132
  • Barrel Length: 8.5"
  • Gas System: Pistol-length
  • Barrel Profile: Heavy
  • Barrel Steel: Chrome Moly
  • Barrel Finish: Phosphate
  • Chrome Lining: None
  • Muzzle Thread: 5/8-24"
  • Chamber: 300AAC Blackout
  • Twist Rate: 1 in 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: M4
  • Handguard Type: 7" Lightweight M-Lok Rail
  • Bolt Carrier Group Included: Yes
  • Bolt Steel: Carpenter 158
  • Bolt Carrier Profile: Full-Auto
  • Charging Handle Included: Yes
  • Overall Length: 17"

Add To:

Barrel: Chambered in 300AAC Blackout with a 1:8 twist rate, M4 barrel extension, and a pistol gas system this barrel features a phosphate finish for accuracy and durability. It is finished off with a PSA 7" Lightweight M-Lok rail, .750" diameter low profile gas block, and an A2 flash hider.

Upper: Forged 7075-T6 A3 AR upper is made to MIL-SPECS and hard coat anodized black for durability. Featuring machined T marks, and a mil-spec finish. 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.

Each upper is assembled to order with care, and test fired.

SKU: 5165449132
SKU 5165449132
Brand Palmetto State Armory
Daily Deal No
Daily Deal Expires No
Youtube Video No
Free Shipping? Yes
Free Shipping Qty Label N/A
Free Shipping Qty N/A
SKU: 5165449132

Questions and Answers

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Browse 7 questions Browse 7 questions and 9 answers
Is the barrel metal 4150 cmv?
Aaron on Aug 18, 2018
Anyone actually run this upper with live ammo ? Buffer and buffer spring are “carbine” and wondering if upper is still overgassed with “carbine” and pistol gas system.
frank w on Sep 22, 2018
BEST ANSWER: Strange question.

Yes... I've put over 400 rounds through mine. Ran fine with several different weight rounds. All supersonic. Haven't gone subsonic yet.
Can you use the same mags as for the 5.56 ?
Andrew P on Sep 21, 2018
What is the weight of this upper?
Marshall L on Sep 27, 2018
Can this upper use a suppressor?
Patti on Sep 30, 2018
BEST ANSWER: Of course. Take off the flash hider and attach your supervisor of choice.
Is the gas block pinned or set screws?
Cotie C on Sep 22, 2018
BEST ANSWER: Set screws.
How difficult is get access the muzzle device, will you have to remove the handguard on this specific upper? It's hard to tell in the picture. I'm asking because I want to mount a suppressor with flash hider and don't want to remove the handguard everytime. Thanks
Michael N on Nov 7, 2018
BEST ANSWER: No problem accessing the muzzle device. Do not have to remove the handguard.


4.4 / 5.0
36 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Does just what is advertised
Just received mine Quality and finish is great. Took it to the range only fired about 30 rounds at 25 yards to set my red dot sight. Shooting 3 round groups each group was under an inch. No failures.
April 20, 2019
2 weeks ago
issues with QD
like mentioned above, the QD from magpul and Haley slings will pop out of the hole provided on the handguard, does this on either side of the handguard. Machining issue I suppose, either way, its a good way to bounce your weapon off the concrete or dump it in the dirt
February 23, 2019
Response from Palmetto State Armory
We do apologize for that. Please contact Customer Service so we may resolve this issue.
February 27, 2019
Casey S
Happy Happy Happy Happy
February 15, 2019
7 months ago
Awesome short barreled upper!
User submitted image
User submitted image
February 5, 2019
4 months ago
Great pistol upper
I'm impressed with this heavy bbl upper. Very solid and have no issues yet. Great quality and an excellent value.
PSA 8.5 300BO next to PSA A2 20" 5.56
PSA 300BO 8.5".300BO, LAW folder, Equinox nv, Holosun solar green dot, 20rnd mag
December 15, 2018
5 months ago
Great budget 300blk upper
Upper has very nice fit and finish. BCG is mil-spec quality, nothing fancy but not bad either.
My build with 8.5 300blk upper on aero precision lower. SBA3, MRO, and insight light
My build with 8.5 300blk upper on aero precision lower. SBA3, MRO, and insight light
December 12, 2018
7 months ago
Very good, and very budget friendly.
Overall impressions very good. Fit very nicely with all components, very light weight.
Shipped very fast, arrived in 3 days.
User submitted image
User submitted image
December 8, 2018
5 months ago
300 blkout
With all that is included, you can not go wrong. Shots great looks better.
December 7, 2018
6 months ago
I love this little gun, one of my favorites
It runs great, no issues with it
November 27, 2018
6 months ago
Good product at a great price
everything was well fitted and went together easily with the rest of my mil-spec parts. Good value with QD release holes
November 22, 2018
6 months ago

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