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 $ 279.99

Quick Overview

free shipping Free Shipping applies to this item only and not the entire order.

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 www.p65warnings.ca.gov (CA Health and Safety Code Section 25249.6).

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"

Add To:

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 48 questions Browse 48 questions and 119 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.
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.
Is the A2 flash hider removable/threaded?
Adam B on Jul 30, 2018
BEST ANSWER: yes. 5/8x24 threads.
Who is the barrel manufactured and finished by?
Francis R on Sep 13, 2018
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
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!
Does anyone know the weight of this complete upper?
Sean M on Aug 1, 2018
BEST ANSWER: 4 lb 6 oz
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.
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.
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
J M on Sep 10, 2018
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.
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.
Will PSA ever bring this upper back?
Maverick on Oct 22, 2018
BEST ANSWER: I think they should. Its a nice upper.
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 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.
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


4.8 / 5.0
126 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Great Value! Need some refinement though!
Great complete upper. Awesome value. Shot roughly 300 rounds through it so far. Pros: Very light weight. I like the many relief cuts in the forward handguard, solid feel. Cons: Seems loose (too narrow) at front rear pins when mated to my Colt AR15 lower receiver. There is way too much side to side freeplay experienced. Note: This is not the permanent lower receiver for this upper; I'll double check the clearances on Aero Precision M4E1 lower. Also, experienced the front hand guard sliding forward, loosening up after this shooting session. Will need to recheck the torque on those handguard retaining screws!
Handguard loosened up, walked off barrel nut!
Overall Upper w/ Optic
June 23, 2019
1 month ago
Great buy
Works great reliable
June 21, 2019
2 months ago
Sent it back for repair after firing half a mag at the range. Got it back some thing happened got a refund.
June 20, 2019
2 months ago
Great poroduct
Works like a dream,everything you need.
June 17, 2019
2 months ago
Super price; fast shipping; excellent product. Cannot wait to hunt with it this year.
June 16, 2019
2 months ago
Very Happy
Very happy with overall performance. Very light and balances well. Only issue as of 100 rounds was bolts for hand guard. Added Blue loctite to keep it from walking forward.
User submitted image
Added Jun 15, 2019
June 15, 2019
2 months ago
The price was great, the look was even better. All together, it is perfect. One issue I had was I didn't have enough money to get 2.
June 14, 2019
2 months ago
Great Deal
This is a great upper for the price. I took it out and within 7 shots I had it zeroed and shooting three inch groups at 100 yards. Finish and quality are great. I highly recommend buying this upper if you are looking to get into a 300 BO.
June 10, 2019
4 months ago
Great buy for your money.
Great piece of equipment the bolt is great, barrel is awesome but trigger is a little tight. Also had to tighten down the barrel guard, was slipping forward after a few rounds, other than those two little things it’s an awesome piece.
On Aero lower.
On Aero lower.
June 6, 2019
2 months ago
Shipping was fast and recieved my upper in perfect condition. Installed it on a 80% lower with no issues noted. Shot over 100 rounds thru it with zero failures to feed or eject. the groups at 100 yards was not less than MOA ( 1.25 to 1.5 inches @ 100 yrds ) but to be fair I was using the cheapest ammo I could find but still not bad groupings for bottom line ammo. I'm thinking a 6.5 Grendel is next.
June 1, 2019
6 months ago

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