PSA 10.5" Carbine-Length 5.56 NATO 1/7 Nitride 12" Slant M-lok Upper - With BCG, CH, & MBUS Sight Set - 5165449684

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PSA 10.5" Carbine-Length 5.56 NATO 1/7 Nitride 12" Slant M-lok Upper - With BCG, CH, & MBUS Sight Set - 5165449684


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.

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: 5165449684
UPC: 5165449684
MFR#: 5165449684
  • Barrel Length: 10.5"
  • Barrel Profile: A2
  • Gas System: Carbine-length
  • Barrel Steel: 4150V Chrome Moly Vanadium
  • Barrel Finish: Nitride
  • Chrome Lining: No
  • Muzzle Thread: 1/2-28
  • Chamber: 5.56 NATO 
  • Twist Rate: 1:7
  • Barrel Extension: M4
  • Diameter at Gas Block: .750
  • Gas Block Type: Low-profile
  • Muzzle Device: Palmetto State Armory Fluted Flash Can
  • Receiver Material: Forged 7075 T6
  • Receiver Type: M4
  • Hand guard Type: PSA 12" Slant End M-Lok Rail
  • Bolt Carrier Group Included: Yes
  • Bolt Steel: Carpenter 158
  • Bolt Carrier Profile: Full-auto
  • Charging Handle included: Yes
  • Includes: Magpul MBUS Sight Set, Black
  • Overall Length: 21"
  • Weight as configured: 3.45 lbs.

Add To:

Barrel: 10.5" 4150V Chrome Moly vanadium steel, melonite treated for durability and chambered in 5.56 NATO with a 1 in 7" twist. Carbine length gas barrel is finished off with a PSA 12" Slant End M-lok Rail, a low profile gas block and a Palmetto State State Armory 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 new Fluted Flash Can! This is a solid 6061 aluminum device that is designed to direct muzzle gases and the muzzle flash forward. Threaded 1/2-28 for 5.56 NATO. Black mil-spec 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. Bolt carrier is parkerized outside, and chrome lined inside.

Includes: Magpul MBUS Sight Set, Black

SKU: 5165449684
SKU 5165449684
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: 5165449684

Questions and Answers

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Browse 6 questions Browse 6 questions and 11 answers
Is the gas block pinned?
Hans P on Feb 16, 2019
BEST ANSWER: Not pinned. 2 set screws. Barrel not dimpled.
Is the Flash Hider removable?
Andrew on May 24, 2019
BEST ANSWER: Yes, it is removable.
Is the barrel dimpled?
Dark B on Apr 25, 2019
BEST ANSWER: No it is not.
Does anyone know what rail this is?
Mitch Y on Nov 27, 2018
BEST ANSWER: Psa makes it. Chekc info psa lightweight
Will this fit Anderson Manufacturing lower receiver?
Zach E on Nov 25, 2018
BEST ANSWER: As long as its milspec it should work just fine
Does it come with a full auto bolt carrier group?
Redwolf on May 27, 2019


4.1 / 5.0
14 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Nope. Not for me, maybe I just got a dud
Didn't mate properly on my Franklin armory binary trigger equipped pistol lower purchased from Franklin armory directly.
The holes for the take down pins were too small. 3 other uppers mated with my lower fine. This one required using a mallet to lock them in and a mallet and punch to get them out...
Returned it. A PSA CHF 10.5 in upper now sits on it just fine.
Worked out well though because I ended up buying a suppressor I'll actually get my hands on next yr and this handgaurd is quite thin and would not fit a 1.5 in diameter supressor.
It's kind of a really stupid design in my opinion
June 17, 2019
2 months ago
Worth the Money
I haven't had a chance to put many rounds through it, but the fit and finish are very good. It locks up tight with a Poverty Pony lower. The finish is very good, and feels much better in the hand than many hand guards in this price range. Also, it looks cool, and we all know looking cool is the most important thing.
June 11, 2019
2 months ago
Great upper for a pistol build. No issues whatsoever.
May 30, 2019
6 months ago
Really nice upper. Would buy again
May 30, 2019
1 month ago
Pretty good
Very annoyed with the out of spec rail. Slightly unsure if I should try to hammer the rear mbus sights on.

Everything else has worked great for the price though.
May 19, 2019
Response from Palmetto State Armory
We do apologize for that. Please contact Customer Service so we may resolve this issue.
May 20, 2019
Casey S
Don't listen to the negative. Buy one!
I ordered this on a Wednesday night and got it to my house on that following Saturday! Not to mention it was shipped UPS which was great because Ive waited longer on Amazon packages. As far as the upper goes, its awesome. The only gripe I have is the BUIS that it came with only allowed me to put the front sight on. The rear sight wont fit on the rail. It does suck but I got over it and used it for another build. Must be something with the rails on this upper.
May 1, 2019
Response from Palmetto State Armory
We do apologize for that. Please contact Customer Service so we may resolve this issue.
May 2, 2019
Casey S
Great function, out of spec rail that requires hammering the magpul MBUS on, also MBUS scrached finish installing. Shows how crappy the finish is too
So, I got this on sale, and have yet to shoot it. This is assuming that it shoots great like every other psa product I've bought.
PSA does great functionality but man, craps out on some of the smaller things.
The other guy who mentioned out of spec rails making the magpul sights a nightmare. Ditto. After pinching my had very badly and then actually slicing my hand open trying to install the rear site bc the rail was out of spec (handgaurd rail was great but the front half that was part of the upper visually looked different than the handgaurd half) I had to use a rubber mallet. By the end, the site had put a nice dent on one section of rail that showed the nice shiney metal under the finish... Not thrilled...
Secondly. Mlock was not good here in this set up. Atleast if you want something underbarrel. Key mod would have been better.
I wanted to mount a bipod temporarily for zeroing in. Bought a oem magpul picatinny adapter.
The front 2 mlock slots are useless. There are 2 protrusion on the barrel. I don't know all the parts but I'm pretty sure the one is the gas block and the other is the can at the end. If you try to use the last section of the rail, the furthest screw on the picatinny adapter hits the can before being screwed in. Using the second to last mlock slot, the first screw on the adapter hits the gas block before going in all the way...
The short length means that pretty much any attachment will be close to the mag well rather than the end of the barrel.
Because I only temporarily want a bipod on, I attached the rail segment on 1 point and will try to be careful with it when sighting it in
April 29, 2019
Red Robin
It’s awesome!!!
I love it
It’s a tack driver!!!!
April 13, 2019
4 months ago
Great gun for the money
April 13, 2019
4 months ago
Terrible quality
Upper out of spec. Included mbus sight's wouldn't fit on rail because the rail is too wide (.837"). Dust cover flips open when tapped. Bolt carrier isn't chrome lined as advertised. Upper receiver is also just terribly finished and has what looks like weld marks on it and it doesnt line up well with PSA lower.
February 26, 2019
4 months ago
Response from Palmetto State Armory
We do apologize for that. Please contact Customer Service so we may resolve this issue.
February 27, 2019
Casey S

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