300 blackout upper receiver kit

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

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Regular Price: $ 479.99

Special Price $ 299.99

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 44 questions Browse 44 questions and 118 answers
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
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.
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.
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!
Will this fit and work properly on a PSA .556 complete lower that I currently own?
Jerry B on Aug 15, 2018
BEST ANSWER: Yes it should be fine.
Does anyone know the weight of this complete upper?
Sean M on Aug 1, 2018
BEST ANSWER: 4 lb 6 oz
Who is the barrel manufactured and finished by?
Francis R on Sep 13, 2018
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: Mine is under a MOA with 165 grain Speer BT and a MOA with Powder Coated Cast Lee 155.
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
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
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.
Can the 300 AAC blackout upper be shipped to California? The flash hider is illegal in Cali...,but I plan to replace it.
Ram P on Nov 16, 2018
J M on Sep 10, 2018
What is the diameter of the handgaurd?
Tysor H on Aug 15, 2018
BEST ANSWER: 2 1/8 in
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.
How many rifling grooves?
Jess S on Aug 16, 2018
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 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.
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.
Do I need a new buffer spring for this to work on my ar15 lower?
James H on Feb 23, 2019
BEST ANSWER: I ordered a new complete lower for mine. With that said my friend ordered the same upper an put it on his old 556 lower an didn’t change anything an it worked properly. I would say from experience you would not have to put a new buffer spring into the lower unless your current spring is needing replaced in the first place.
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 fit on my Diamond Back AR15 5.56?
Bobber on Feb 17, 2019
BEST ANSWER: The upper will fit on any mil spec ar15 lower, used same mags. I have a 8.5 pistol and 16 rifle upper in 300 aac, love that round
Will this fit my ATI OMNI HYBRID MAXX AR15 lower ?
Darren on Feb 22, 2019
BEST ANSWER: I have no knowledge of the ATI OMNI, However if this helps. I have had mine on a Windham Weaponry and spikes tactical lower and it fit both very well with zero malfunctions on either. They are both standard mil spec receivers. Hope this helps you.
Is this upper compatible with a S&W AR15 lower?
EDWARD E on Feb 11, 2019
BEST ANSWER: I contacted S&W with the same question and was tols as long as the pins are mil spec it will work. I ended up assembling mine on a PSA lower but it should work on the S& W lower
So this upper will fit a Bushmaster lower?
Konrad K on Feb 12, 2019
BEST ANSWER: As long as your Bushmaster Lower is Mil Spec Compliant, it should fit. Just check to make sure you are in compliance with all laws, Federal, State, and Local t6hat apply. The "Pistol Length" refers to the gas system and not the barrel length. It would be most appropriate on a rifle or carbine style lower with it's 16" barrel.


4.8 / 5.0
93 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Great purchase. Have only gotten to put a few rounds down range. But so far very accurate can't wait to play around loads and see what I can get
March 24, 2019
1 month ago
Great deal I’d buy again
March 24, 2019
1 month ago
Great 300 Blackout upper!
My first AR15, and I am thrilled with the upper from Palmetto! Fired 180 rounds through it today with no issues. Built an Anderson lower and it fits great with this upper.
First 6 rounds fired through my PSA 300 Blackout upper. On an Anderson lower.
First 6 rounds fired through my PSA 300 Blackout upper. On an Anderson lower.
March 24, 2019
1 month ago
Excellent Upper except the handguard keeps walking
I've put a couple hundred of rounds through this upper and it shoots very well with the exception of the walking handguard. I'm using a bipod and I know that the recoil is pulling against it and pulling them apart. I've used blue loctite to no avail. I've now substituted the 3/32 allen bolts with 9/64 bolts and blued them in. The 9/64 allen bolts at least allow a more decent snug tightness. I beleive this has solved the issue, I'll know soon.
Other than this it is really fun to shoot,
Another range day
with 9/64 allen bolts
handguard walk , repeatedly
March 22, 2019
Love it fits my Anderson lower beautifully would recommend psa to anyone
March 20, 2019
1 month ago
Great addition to your quiver of AR uppers.
Love the upper if I had one wish it would be that 300 AAC was etched on the rail for those of us with multiple uppers from PSA that look a lot alike.
March 8, 2019
1 month ago
Pretty good
It was fine except for last shot the bolt won't lock to the rear. Was shooting 150grain ammo still trying to find a fix to the problem guess i will replace tube & buffer spring. Any suggestion or has anyone else experience this issue? Thanks
February 28, 2019
Very pleased functions flawlessly right out of the box.
Took this upper out of the box, ran two patches down the barrel and olied the bolt. Took it to my range and fired several different sonic and two subsonic loads through it. Sonic: Barnes 110's, Hornady 110 grain V Max and 125 grain SST's and S&B FMJ. Subsonic loads: Hornady factory 190 subs and Hornady 209 BTHP. Not one malfunction of any kind suppressed or unsuppressed, subsonic or sonic. To date I have shot approximately 300 rounds of various ammo, suppressed and unsuppressed and still have had zero malfunctions of any kind. Accuracy has been between 1 and 2 inches at 100 yards depending on ammo.
February 22, 2019
7 months ago
Great product!
Paired with PSA Magpul lower! Fit together perfectly no play. Very impressed for the price and nice features
User submitted image
Added Feb 17, 2019
February 17, 2019
1 month ago
Great product at a great price
February 13, 2019
3 months ago

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