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.

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.


4.5 / 5.0
32 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
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
1 month 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
3 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
2 months ago
300 blkout
With all that is included, you can not go wrong. Shots great looks better.
December 7, 2018
3 months ago
I love this little gun, one of my favorites
It runs great, no issues with it
November 27, 2018
3 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
3 months ago
SKU 5165449132 (was ordered, shipped and received even though it is not listed on my purchase history with PSA. Can you PSA folks fix that?) My only problem with this upper is with the BCG. The mating surfaces between the bolt and the carrier are so rough that even though I have fired almost 100 rounds through it and have heavily lubed it with new LSA weapons oil, it remains extremely difficult to pull the charging handle back to unlock the bolt in the bolt carrier from the barrel extension. There is so much resistance that I am surprised the upper functions at all. I have another PSA 300 AAC with a Nitrite finished BCG in 16" that manually cycles almost "as smooth as glass". Disappointed with this one though.
November 19, 2018
Bolt is sticky before break in. Little overgassed with can on. Other than that, very pleased
User submitted image
Added Nov 18, 2018
November 18, 2018
3 months ago
What more could you want?
Built this onto an Anderson lower w/ kak brace. Took it to the range yesterday, and had so much fun! A gun this size is a true joy to shoot. Zero malfuntions over about 150 rds of 120gr and 150 supers, and 220gr subs. Just an unbelievable deal for the price. Recoil for all loadings was surprisingly light, not far off from a 16" 5.56. Accuracy was very good as well, I will be taking it out to 100yds soon and do not expect any issues for man-sized targets. Didn't shoot from a bench or anything, but once it was sighted in I couldn't miss.

The handguard is pretty darn close to the gas block, and I had to grind down one of my m-lok screws to prevent it from contacting the gas block. Not a problem at all for me, and there is more than enough room for the t-nut to operate.

There were 2 fit & finish issues with my upper. The crush washer was a little lopsideded, and the handguard was very slightly out of perfect alignment with the upper. A couple minutes with my torque wrench and everything was perfect. Normally I would take a star off for this, but if I was uncomfortable making these adjustments I would have sent it back to PSA's excellent customer service department without hesitation or worry.

The 8.5" size is just so sweet. Closer to a standard handgun for indoors maneuverability than a 16" ar.

Gonna have to build one in 5.56 now!
User submitted image
Added Nov 16, 2018
November 17, 2018
I haven't taken it out to the range yet but I did strip it down and inspect. Super happy with this upper as always from Palmetto!
November 9, 2018
3 months ago

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