PSA 8.5" 300AAC Blackout 1/8 Phosphate 9" Lightweight M-Lok Upper With BCG & CH  - 5165449733

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PSA 8.5" 300AAC Blackout 1/8 Phosphate 9" Lightweight M-Lok Upper With BCG & CH - 5165449733

In stock

Special Price $ 299.99

Regular Price: $ 479.99

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: 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: 5165449733
UPC: 5165449733
MFR#: 5165449733
  • Barrel Length: 8.5"
  • Barrel Profile: Heavy
  • Gas System: PIstol-length
  • Barrel Steel: 4150V Chrome Moly Vanadium
  • Barrel Finish: Phosphate
  • Chrome Lining: No
  • 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: PSA Fluted Flash Can
  • Receiver Material: Forged 7075 T6
  • Receiver Type: M4
  • Hand guard Type: PSA 9" Lightweight M-Lok Rail
  • Bolt Carrier Group Included: Yes
  • Bolt Steel: Carpenter 158
  • Bolt Carrier Profile: Full-auto
  • Charging Handle included: Yes

Add To:

Barrel: 8.5" Phosphate 4150V Chrome Moly vanadium steel barrel, chambered in 300AAC Blackout with a 1 in 8" twist. Pistol length gas barrel is finished off with a PSA 9" 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's Fluted "FLASH CAN". This is a solid 6061 aluminum device that is designed to direct muzzle gases and the muzzle flash forward. Threaded 5/8-24 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: 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: 5165449733
SKU 5165449733
Department Uppers
Brand Palmetto State Armory
Daily Deal No
Daily Deal Expires No
Unit Price No
Youtube Video No
Free Shipping? No
Free Shipping Qty Label N/A
Free Shipping Qty N/A
SKU: 5165449733

Questions and Answers

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Browse 11 questions Browse 11 questions and 31 answers
When will this be back in stock?
Terry S on Dec 30, 2018
can you use a rifle build kit with this upper?
walter s on Oct 27, 2018
BEST ANSWER: Only with an SBR Tax Stamp!!!!!!!
What does "full auto profile" mean for the BCG?
JEFFREY F on Oct 3, 2018
BEST ANSWER: It just means it is a full weight profile at the tail of the BCG. It does not make your gun an AUTO.
Will this handguard clear an omega 9k suppressor diameter of 1.5"?
Steve W on Oct 10, 2018
BEST ANSWER: I called to get rail diameter and they couldn’t provide me with the information. The best they could provide me with is the diameter of the muzzle device which is around 1.3”. I purchased this and can confirm your suppressor will not fit under this rail.
Does the Handguard have the same issue as I’ve heard other psa 300blk have? I have heard some of the 300blk Handguards slide forward while shooting
Jeff C on Dec 28, 2018
BEST ANSWER: No, it is holding firm. And I cant see how it could slip. It has two through bolts (and three tension/balance screws) that hold it in place. I’ve only got about 300 rnds thru it. But, that should be enough for it to slip it was going to. You should also know that I did remove it after my first range trip and used blue threadlock to reassemble. Not because it was slipping but because I was trying to mount a pic rail (abandoned that bcuz inner diam was was too narrow). Happy with it, but still getting a new one once i get the suppressor.
Would I be able to put a suppressor on straight out of the box?
Bryer M on Oct 14, 2019
BEST ANSWER: As long as the outside diameter of your suppressor is smaller than the inside diameter of the hand guard, most suppressors will not fit in this hand guard.
Is the bolt headspaced with the barrel?
cory r on Jun 16, 2019
BEST ANSWER: If PSA supplies the bolt carrier group as part of the upper, yes. If purchased separately, you should check the headspace before firing.
What buffers or springs are working with this upper ,having trouble cycling mine?
David W on Jan 16, 2019
BEST ANSWER: no issues with fiocci 150 gr and 123 gr magtechs or 110 gr hornady. I have phase 5 pistol buffer tube ergo grips spring and the psa I think 3.1 ounce buffer not single failure expept the gas block screws came loose
Is it possible to remove the flash can and put a compensator on without removing the handgaurd?
Van B on Oct 11, 2019
BEST ANSWER: The malleable section of the can is just under the hand guard. You only have 2 allen screws to loosen to remove and replace the handguard. Skill level: 2!! Lol
Can I put a Fostech echo 2 trigger using this BCG?
Kent A on Nov 18, 2018
BEST ANSWER: I think youd be better off with a 556 or better yet a 9mm ar15 if you want to use a binary trigger. I built this gun and it does have quite a bit more recoil then my 556 pistol so id about bet its going to only be good for wasting ammo because hitting something might be tough.
Is the barrel threaded for a suppresor if I take the muzzle off?
Chrisna B on Nov 14, 2018
BEST ANSWER: 1. It's a flash can. 2. How are you going to take it off if it isn't threaded...?


4.4 / 5.0
9 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
shoots great
had a bit of a problem with light primer hits even using soft federal primers. Ended up swapping out the hammer spring that came with the ept trigger to a standard spring and it worked fine after. Didn't effect the trigger pull that much, probably because is much smoother then a typical mil spec trigger so you don't really notice the pull weight. To be fair it might not have even been a problem but I did put anti walk pins in it and possible the hammer didn't rotate on the pin as freely as it would have on the factory pins. Thing is a ball to shoot though. Shoots barnes 110s into an inch and a half at a 100 yards and shoots cast into 1.5 at 50 and im talking full power loads with 130 gas check cast bullets pc'd. Not 1000 fps sub sonic stuff. I wish theyd make one of those little 10.5 shockwaves in 300 bo too as the bo is fast becoming my favorite round. The ability to shoot cast makes it MUCH cheaper to shoot then a 556.
June 27, 2019
4 months ago
Get this thing. Now.
High quality upper. In every way. 300 rounds in, zero issues. Accurate. No complaints. No loose screws like some other reviews have mentioned. I love the fluted flash can :)
June 19, 2019
6 months ago
Hands down my favorite
This is pretty awesome. I am so happy with my first build. I got a spikes tactical lower on mine the finish matches pretty well. Please be aware however today I realized the gas block and the handgaurd screws are not very tight or loktited as my gas black slid forward after the first shot and exposed the port no damage as far as i can tell after inspection but this is a bit frustrating as I was 40 minutes away at the range with 1 not working gun! but seriously still awesome have not had a single failure otherwise I built my Lower with the phase 5 hex pistol buffer tube, ergo grips recoil spring, and the psa carbine buffer(weighed I think 3.1 ounces which is fairly light)
April 16, 2019
Response from Palmetto State Armory
We do apologize for that. Please contact Customer Service so we may resolve this issue.
April 17, 2019
Casey S
I really like it
I love the feel of my 300 blackout pistol with 8.5" PSA upper. I have a Sig Romeo 5 red dot on I it and it very accurate!. Still working on what Ammo functions best through it with the fix gas block.
February 24, 2019
10 months ago
Great quality for the money.
This is a great purchase for the money. Complete assembly with Charging handle, Bolt carrier group, and the PSA fluted flash Can delivered impressed results.
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February 22, 2019
10 months ago
Facial trauma.
I’m giving it a 3 because I’m not sure of the issue just yet. On the last round shot when the bolt locks back the charging handle is kicked back into my face. It hurts a little and if I was smiling I’d probably lose a tooth. I’m going to try a better charging handle first then an adjustable gas block.
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Added Jan 15, 2019
January 15, 2019
12 months ago
Fantastic value
This quality complete upper for 300 Blackout AR flat form was a perfect match for my AR pistol. Finish and fit is superb, accuracy is decent for a 8.5 inch barrel. The Flash can divert the sound forward. The M-Lok hand guard is beautifully made, slim and precisely fit the barrel nut. Very affordable. I enjoy shooting this caliber and as a reloaded I can make my ammo in a variety of load from supersonic to subsonic. Highly recommended. Good job PSA!
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December 10, 2018
1 year ago
So far so good
So far so good but gets dirty super fast
November 26, 2018
1 year ago
November 16, 2018
1 year ago

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