8.5" 300 aac blackout upper

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PSA 8.5" Pistol Length 300AAC Blackout 1:7 Nitride 7" Lightweight M-Lok Upper With BCG & CH - 5165449777


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: 5165449777
UPC: 5165449777
MFR#: 5165449777
  • Barrel Length: 8.5"
  • Gas System: Pistol-length
  • Barrel Profile: Heavy
  • Barrel Steel: Chrome Moly
  • Barrel Finish: Nitride
  • Chrome Lining: None
  • Muzzle Thread: 5/8-24"
  • Chamber: 300AAC Blackout
  • Twist Rate: 1 in 7"
  • 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 1:7 twist rate, M4 barrel extension, and a pistol gas system this barrel is nitride treated 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.  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: 5165449777
SKU 5165449777
Brand Palmetto State Armory
Daily Deal No
Daily Deal Expires No
Youtube Video No
Free Shipping? Yes
Free Shipping Qty Label No
Free Shipping Qty No
SKU: 5165449777

Questions and Answers

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Browse 9 questions Browse 9 questions and 8 answers
So is it 1/7 or 1/8? The title and specs don't match.
B R on Nov 13, 2018
BEST ANSWER: Looks like they fixed it - 1:7! Great for supes and subs!
Is the gas block drilled and pinned?
Marcus S on Nov 16, 2018
Is a special,permit required prior to purchase or to own the gun?
Bob B on Oct 25, 2018
BEST ANSWER: You can purchase this upper without any paperwork as it is just an upper. IF you mount the upper on a rifle lower then you have created an SBR (Short Barrel Rifle) which requires an NFA stamp. If you mount it on a pistol lower, then no permit is required.
Is this already put together?
Adam B on Nov 10, 2018
BEST ANSWER: The upper is assembled as shown and ready to pin to your pistol or SBR designated lower.
How heavy is the rifle?
Quinn on Dec 6, 2018
BEST ANSWER: This upper assembly is short and lightweight. It handles well with a pistol lower. The flash hider extends beyond the handguard sufficiently to swap for s suppressor or suppressor mount.
What additional parts are required to add an angled fore grip?
patrick d on Nov 14, 2018
BEST ANSWER: This handguard will accept any Mlok configured grips and accessories.
Is this a threaded barrel?
Cody S on Oct 15, 2018
BEST ANSWER: From the item description: Muzzle Thread: 5/8-24"
Is the bolt carrier that comes with this upper full auto or does it have the semi auto cutout on the bottom at the rear?
Chris D on Jan 15, 2019
BEST ANSWER: description says the bcg profile is full auto
Can I mount this upper to my PSA 7.5 Pistol Length 5.56 Nato lower? if so would I need new mags for the 300
Jesus A on Dec 20, 2018
BEST ANSWER: Yes, you can use a 5.56 lower and you can use your regular 5.56 magazines with 300 blackout.


4.8 / 5.0
35 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Can’t Beat it!!
100% reliable with every ammunition I have used. I have used everything from120 grain to 220 grain subsonic with zero malfunctions! The fit and finish was perfect in my PSA lower. The 8.5” seems like the perfect length for a pistol in 300 blackout!!
I’ll be looking to get a 10.5 inch 556 upper as soon as I can! Thanks PSA!
User submitted image
Added Mar 18, 2019
March 18, 2019
2 months ago
Fantastic PSA Complete Upper
I put this complete upper on top of an Anderson lower with the SBA3 brace and topped it with a Vortex Strikefire 2. This upper from PSA is outstanding! Flawless function for the few hundred rounds I’ve put through it so far. Love it!
Yep, my RDS mount is backwards!
Yep, my RDS mount is backwards!
March 16, 2019
2 months ago
Great deal . Functions perfectly
Great product. I attached to a lower I had laying around and so far has functioned flawlessly. I am planning to use this for deer hunting in North Georgia where most shots are 100 yds or less. I had an accident at work a couple of years back which left me handicapped and walking with a cane. I can no longer carry a full size rifle hunting so I purchased this upper and added a pistol brace.
March 16, 2019
2 months ago
Snek 300 AAC Blackout PSA compete AR pistol build. Runs flawlessly. Great Shooter!
Snek 300 AAC Blackout PSA compete AR pistol build. Runs flawlessly. Great Shooter!
Snek Blackout. Complete PSA pistol build. Functions flawlessly. Great shooter.
Snek Blackout. Complete PSA pistol build. Functions flawlessly. Great shooter.
March 15, 2019
2 months ago
Superb upper!
Very accurate. I have a sig Romeo 5 on mine and love it. Runs smooth with no issues so far (only 200 rnds). No regrets!
February 25, 2019
2 months ago
what I needed to complete my build
great bargain good quality
February 21, 2019
2 months ago
Excellent Product!
Great quality and made in the USA. Perfect for my pistol build!
February 19, 2019
3 months ago
Perfect as always, I have purchased many items over the years from PSA and have never been disappointed. Your description is dead on every time. I'm an FFL dealer and have recommended many of my customers to buy from your site. Thank You
February 16, 2019
3 months ago
Looks great and shoots great. Thanks
February 16, 2019
3 months ago
8.5 PSA 300BLK
January 31, 2019
3 months ago

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