PSA 16" Pistol-Length 300AAC Blackout 1/8 Nitride 15" Lightweight M-Lok Upper - With BCG & CH - 5165448932

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PSA 16" Pistol-Length 300AAC Blackout 1/8 Nitride 15" Lightweight M-Lok Upper - With BCG & CH - 5165448932


Quick Overview

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SKU: 5165448932
UPC: 5165448932
MFR#: 5165448932
  • Barrel Length: 16"
  • Gas System: Pistol Length
  • Barrel Profile: Heavy
  • Barrel Steel: 4150V Chrome Moly Vanadium
  • Barrel Finish: Nitride
  • Chrome Lining: None
  • Muzzle Thread: 5/8-24
  • Chamber: 300 AAC Blackout
  • Twist Rate: 1 in 8"
  • Barrel Extension: M4
  • Diameter at Gas Block: .750"
  • Gas Block Type: Low-profile
  • Muzzle Device: A2 Flash Hider
  • Receiver Material: Forged 7075 T6
  • Receiver Type: M4
  • Handguard Type: PSA 15" Lightweight M-Lok Rail Partial Picatinny Free Float
  • Bolt Carrier Group Included: Yes
  • Bolt Steel: Carpenter 158
  • Bolt Carrier Profile: Full-Auto
  • Charging Handle Included: Yes
  • Overall Length: 24.5"

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Barrel: This Chrome Moly vanadium 4150V barrel is chambered in .300 AAC Blackout with a 1:8" twist, M4 barrel extension, and a pistol-length gas system. It is finished off with a .750" diameter gas block, PSA 15" Lightweight M-Lok Partial Picatinny free float rail, and an A2 Flash Hider.

Upper: The forged 7075-T6 A3 AR upper is machined to MIL-SPECS and hard coat anodized. 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 nitride treated.

SKU: 5165448932
SKU 5165448932
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: 5165448932

Questions and Answers

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Browse 35 questions Browse 35 questions and 71 answers
Can you screw a suppressor on this barrel, or will it hit the hand guard?
Ray M on Aug 15, 2018
BEST ANSWER: Yes, but I would assume it depends on the suppressor. My Dead Air Ghost 45M fits on the upper using direct threads with no issues and about 2-3mm of clearance in front of the end of the handguard.
Why have a pistol length gas block on 16" barrel?
Thomas K on Jul 27, 2018
BEST ANSWER: It's not a pistol length gas block. It is a pistol length gas SYSTEM. This works best with the 300 blackout cartridge but does NOT make it a "pistol" upper
Has the head space been checked? Is the upper ready to go?
David F on Aug 20, 2018
BEST ANSWER: Slap it on a lower and you're ready to go.
Is the A2 flash hider removable/threaded?
Adam B on Jul 30, 2018
BEST ANSWER: yes. 5/8x24 threads.
Will this upper work on any other lowers???
Michael on Jul 27, 2018
BEST ANSWER: these fit and function on any quality AR15 lower. psa has the pistol gas port dialed in spot on for hornady 110gr or 208gr. the new lightweight rails feels and functions great.
Does anyone know the weight of this complete upper?
Sean M on Aug 1, 2018
BEST ANSWER: 4 lb 6 oz
So basically complete a designated pistol lower set and then add to this and I’m good? Thanks
Saint on Jul 27, 2018
BEST ANSWER: Since this is a 16" does not have to be a pistol lower! Can be a Carbine or Rifle Lower!
How is accuracy? MOA at 100 yards. Plan on using this upper for hog hunt 50-100 yards
Vinny B on Aug 21, 2018
BEST ANSWER: one to two moa w. hornady 110gr, w. iron sights. very adequate for hunting ferals.
Will this fit and work properly on a PSA .556 complete lower that I currently own?
Jerry B on Aug 15, 2018
I have a smith and Wesson sport 2. Can I just switch out the upper of my AR15 and replace it with this upper to get a higher caliber? Does the CH and BCG need to be change everytime or can they use the same one?
TITUS Y on Aug 5, 2018
BEST ANSWER: yes, 556 and 300 use the same CH, BCG, and mags
Does anyone know if the DPMS G-2 in. 308 Lower will fit this upper since the G-2 can be fitted with other AR15 accessories?
Ronnie on Aug 1, 2018
BEST ANSWER: Absolutely not, this is for ar15 platform only. Mags work too.
Is it over gassed? If so is it possible to replace with an adjustable gas block?
Travis W on Aug 21, 2018
BEST ANSWER: It really depends on what loads you intend to use and if you will be adding a suppresor into the mix. I have not had any issues so far with loads from 110grain to 155grain without a suppressor. It had a failure to eject one time in the very beginning, but so far no malfunctions whatsoever since. I chalked it up to the break in period within the first ten rounds or so, using some odd ball ammo. If you really like to tinker, an adjustable gas block and an assortment of buffer weights can keep you happy. I just dropped this on a decent mil-spec lower and haven't looked back.
Show many rifling grooves does this barrel have?
Jess S on Aug 15, 2018
What is the diameter of the handgaurd?
Tysor H on Aug 15, 2018
BEST ANSWER: 2 1/8 in
Who is the barrel manufactured and finished by?
Francis R on Sep 13, 2018
J M on Sep 10, 2018
How many rifling grooves?
Jess S on Aug 16, 2018
Is this fully assembled?
Mr Campbell on Aug 16, 2018
BEST ANSWER: Aside from needing to mount it on a complete lower, it is basically complete except for your choice of sights or optics.
Will PSA ever bring this upper back?
Maverick on Oct 22, 2018
BEST ANSWER: I think they should. Its a nice upper.
Is the flash hider pinned welded to hit the 16" or is the barrel 16" plus the muzzle device ?
Joseph G on Nov 7, 2018
BEST ANSWER: Not welded. The barrel is 16" plus muzzle device.
Will this upper fit on a stag arms Ar15 complete lower?
Ice Ghost on Nov 7, 2018
BEST ANSWER: fit my S & W M&P SPORT perfectly - can swap .223 to .300 in minutes - looks good and no problems so far
Will this complete upper fit on a Sig M400 lower?
Dan L on Dec 16, 2018
BEST ANSWER: As long as it’s mil-speck, I see no reason why it won’t. I have mine on a rock river lower and it works fine
Im not too familiar with the ammo for this 300, what seems to work best with this set up for hog?
Al G on Dec 5, 2018
BEST ANSWER: I personally like to use s super sonic ammo such as a 125 grain, has more of a punch to it. But being you looking for hog probably be better at like a 220 grain sub sonic or I think it's a 175 grain or close to that. When I first got my .300 I got 3 types and brands and I personally like the 125 grain ppu. Stays accurate for me when I'm hog hunting, or hunting in general
What company makes this Barrel?
T T on Nov 15, 2018
BEST ANSWER: It is marked PSA. In my research i have found that PSA makes just about all of the AR parts they sell.
Will this work with a Anderson lower?
Eric B on Aug 23, 2018
BEST ANSWER: I used it on an Anderson Lower today with PSA part kit. Worked Great really enjoyed my first experience with 300 AAC
Will this fit my psa freedom rifle?
jeff h on Aug 23, 2018
BEST ANSWER: will pin right up.
What else do I need to complete the ar?
Thedude on Aug 22, 2018
BEST ANSWER: A complete lower and some kind of sights or optics.
what is the inside diameter of the m-lok rails? trying to decide if my suppressor will have any interference and if so if it'll fit inside the rail?
Blake on Jan 16, 2019
BEST ANSWER: 1.35 is what mine measures on the inside.
What buffer is required to avoid any issues?
Snake on Sep 14, 2018
BEST ANSWER: I just use the basic buffer and spring that came with this kit and it works fine, I also used a heavy buffer and buffer spring and it worked perfectly with those as well.
Palmetto State Armory Magpul MOE Lower Build Kit - Flat Dark Earth - 600
Palmetto State Armory Magpul MOE Lower Build Kit - Flat Dark Earth - 600
So after completing a build with this. Will this be considered a pistol or a rifle, Can i use an adjustable stock on this legally ?
Gwendolyn E on Sep 12, 2018


4.9 / 5.0
75 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
reasonably priced upper love it
Nice upper shoots well with suppressor
January 18, 2019
2 months ago
Loving my first build!
Giving it 4 stars because while sighting in the rifle the handguard rail starting moving forward. Once i tightened up the screws with some Gun-Tite things run smooth!
300 Blackout her name is MAMIE!
300 Blackout her name is MAMIE!
January 16, 2019
2 months ago
300 Blackout
Upper arrived in perfect shape. It mates with my custom completed (by me) 80% lower. Haven't shot it yet, I still need to make two more changes to make it DPRC (California) compliant.
300 Blackout AR 15
300 Blackout AR 15
January 8, 2019
2 months ago
Not bad for the money.
This got shipped to me in 3 days.
Overall I am pleased so far with about 200 rounds tested. I am currently sub MOA with 150gr Hornady reloads, with a Nikon 3x9x40. Had a few hiccups the first mag, but after break in it runs smooth. The only complaint is the hand guard kept walking off the upper. I added blue loctite to the guard screws and so far it is holding, that is the reason for 4 star instead of 5.
December 26, 2018
2 months ago
Perfect for hunting and or home defense.
I bought this as a key component to my first AR build. I love the 300 Blackout ballistics. The upper that I ordered came with the bolt carrier group and all I had to add was an optic and iron sights. It shoots and functions very well and I am quite pleased with my purchase! The next Bills will be a 458 Socom...😎
Blackout Bart
Blackout Bart
December 26, 2018
2 months ago
Highly recommend this product and PSA
I ordered this upper on Dec 16th expecting a delay with the holiday season approaching, but PSA got it to me Dec 22 !! At the earliest, I was expecting it to arrive at the beginning of the new year. So bravo PSA, excellent service there.
The upper comes exactly as pictured. After looking over the entire upper upon its arrival, I couldn't find any defects, scratches, or dents. It fit flawlessly on my stag-15 lower. Anything mil-spec will work. Felt very solid once added to the lower. This is a quality product, thoroughly made. I am very happy with my purchase, and you will be too. Thank you PSA, excellent work and great service. I will be a returning customer!
16" Pistol-Length 300AAC Blackout on (mil-spec) stag 15 lower
16" Pistol-Length 300AAC Blackout on (mil-spec) stag 15 lower
December 22, 2018
300 black out is awesome!
Love the 300 black out. Much more effective than .223/.556.
December 17, 2018
5 months ago
Good looking upper. Light weight. Very accurate. Sub moa with cheap 150 grain ammo. Fits my diamondback lower and spikes lower perfectly.
December 16, 2018
2 months ago
Outstanding product!
December 16, 2018
2 months ago
Great value
Great product, great value
December 16, 2018
2 months ago

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