PSA 7.5" Phosphate 300AAC Blackout 1/8 6" Lightweight M-Lok Upper - With BCG and CH - 5165447573

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PSA 7.5" Phosphate 300AAC Blackout 1/8 6" Lightweight M-Lok Upper - With BCG and CH - 5165447573


Quick Overview

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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: 5165447573
UPC: 5165447573
MFR#: 5165447573

Barrel Length: 7.5"
Gas System: Pistol Length
Barrel Profile: Heavy
Barrel Steel: 4150V 
Barrel Finish: Phosphate
Chrome Lining: None
Muzzle Thread: 5/8-24
Chamber: 300AAC 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: M4
Handguard Type: PSA 6" Lightweight M-Lok Free Float 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: 7.5" Chambered in 300AAC Blackout, with a 1:8 twist rate, M4 barrel extension, and a pistol length gas system.  This phosphate barrel is finished off with a PSA 6" Lightweight M-Lok free-float 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. 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: 5165447573
SKU 5165447573
Brand Palmetto State Armory
Daily Deal No
Daily Deal Expires No
Youtube Video No
Free Shipping? Yes
SKU: 5165447573

Questions and Answers

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Browse 4 questions Browse 4 questions and 7 answers
Why did PSA. remove my negative review of this product?
NoNoMoor on Jun 21, 2018
BEST ANSWER: I didn’t know that they did!?
Has anyone run this suppressed and had any issues running it suppressed with subsonic ammo?
Ted H on Jun 21, 2018
BEST ANSWER: I run it with an AAC 762 SD, I haven't had any issues with subsonics or supersonics with or without the can. Probably put about 100 rounds of 220 grain subs and maybe 40 rounds of 147 grain supers, no issues suppressed or unsuppressed.
Does a pistol lower with a standard carbine buffer work with 300 blkout or do I have to buy a different pistol lower to use with this upper?
James Z on Jul 10, 2018
BEST ANSWER: I had issues cycling subsonic (hornady black) with the standard spring. Got a softer spring, works awesome. Sig subsonic and "normal" rounds worked well with standard spring. So yes, your lower should work out fine. But you may need a softer spring for some ammo to cycle reliably.
Will you ship this upper to California?
David M on Jun 25, 2018


4.6 / 5.0
11 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Awesome Little AR-15
Awesome upper! I paired this with a PSA pistol lower build kit and PSA Stealth lower. The gun runs flawlessly and is a blast to shoot! All parts are great quality. This isn’t my first PSA build and it certainly won’t be the last.
August 21, 2018
2 months ago
Runs great
Fired with different grains of ammo, all ran flawlessly. Great little upper
August 9, 2018
1 month ago
Just not for me.
This upper is very frustrating. It destroys cases no matter what ammo is used. First experience with a pistol, won’t do it again. In fairness, Palmetto has not heard anything from me on this problem
August 1, 2018
1 month ago
Response from Palmetto State Armory
We do apologize for that. Please contact Customer Service so we may resolve this issue.
August 1, 2018
Casey S
Awesome 300AAC
Awesome upper great price shooting very straight overall happy
July 22, 2018
1 month ago
Great product function well.
June 1, 2018
3 months ago
Works perfect right out of box!
Fires and cycles flawlessly right out of the box on a PSA pistol lower receiver kit. Thanks PSA!
May 30, 2018
6 months ago
Flawless function.
Zero issues with feed and function. Very pleased.
May 23, 2018
6 months ago
Great So Far
So far the upper has worked well, I've only ran a little over 100 rounds through it with no issues. Only time will tell. So far well worth the money.
May 10, 2018
5 months ago
The best
I am so happy with my purchase. Palmetto state armory is a wonderful company
User submitted image
Added May 6, 2018
May 6, 2018
4 months ago
Fun and punchy
Loving this little "toy". I had to use a lighter buffer spring in my PSA pistol lower to get it to cycle the Hornady Black ss. Sig ss worked beautifully without modifications.
May 6, 2018
4 months ago

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