ar-15 16 inch m-lok upper barrel assembly

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PSA 16" Mid-Length 5.56 NATO 1:7 Nitride 13.5" Lightweight M-Lok Upper With BCG, CH, & MBUS SIght Set - 516447488

In stock

Special Price $ 319.99

Regular Price: $ 509.99

Quick Overview

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: 516447488
UPC: 516447488
MFR#: 516447488


  • Barrel Length: 16"
  • Gas System: Mid-length 
  • Barrel Profile: A2
  • Barrel Steel: Chrome-Moly Vanadium
  • Barrel Finish: Melonite
  • Chrome Lining: None
  • 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: A2 Flash Hider
  • Receiver Material: Forged 7075 T6
  • Receiver Type: M4
  • Hand guard Type: PSA 13.5" M-Lok Lightweight Rail
  • 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: 16" barrel length Chambered in 5.56 NATO, with a 1:7 twist, M4 barrel extension, and a mid-length gas system. The A2 profile barrel is finished with Melonite. Barrel is finished off with an .750" diameter low-profile gas block, PSA 13.5" Lightweight M-Lok Free Float Rail and an A2 flash hider.

Upper: Forged 7075-T6 A3 AR upper is hard coat anodized black for durability. Featuring M4 feedramp cuts,  these upper upper receivers are made for us right here in the USA.

Bolt Carrier Group: For AR15 and M16 rifles and carbines. Bolt is made of shot-peened, Mil-spec Carpenter 158® steel. Gas key is secured with grade 8 fasteners and staked. Bolt carrier is parkerized outside and chrome lined inside. Includes Charging Handle.

Includes:  Magpul® MBUS Sight Set, Black 

SKU: 516447488
SKU 516447488
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 No
Free Shipping Qty No
SKU: 516447488

Questions and Answers

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Browse 12 questions Browse 12 questions and 31 answers
Is this barrel 4140 or 4150. Is the barrel melonite treated on the inside?
Chris on Apr 19, 2018
BEST ANSWER: This upper is identical to the one attached below except for the handguard. This one is lightweight, the one below is the standard handguard. However, all of the other stats are the same even though their website descriptions are sometimes lacking. 4150 CMV steel. Also, when a barrel is nitro-carburized with melonite (hence the sometimes interchangeable terms: nitrided/melonite) it is submerged in a salt-bath. The liquid will go everywhere, so the barrel's bore will naturally be treated as well.
PSA 16
PSA 16" Mid-Length 5.56 NATO 1/7 Nitride 13.5" M-Lok Upper With, BCG, CH, & MBUS Sight Set - 5165449691
What is the weight of this upper?
Dan S on May 12, 2019
Anyone know the difference between this and SKU: 5 165449691?
Michael P on Oct 10, 2018
PSA 16
PSA 16" Mid-Length 5.56 NATO 1:7 Nitride 13.5" Lightweight M-Lok Upper With BCG, CH, & MBUS SIght Set - 516447488
PSA 16
PSA 16" Mid-Length 5.56 NATO 1/7 Nitride 13.5" M-Lok Upper With, BCG, CH, & MBUS Sight Set - 5165449691
BEST ANSWER: I believe the rail is the only difference. One is lightweight the other is standard.
what is the weight as shipped?
Alan F on Mar 31, 2019
Is the flash hider pinned and welded? Or just threaded on?
trevor m on May 17, 2018
BEST ANSWER: Just threaded. Generally the only time a flash suppressor is pinned and welded is if the barrel length is less than 16 inches. For example: pinning and welding a flash suppressor onto a 14.5 inch barrel to make it permanently 16 inches to meet NFA requirements.
Is this compatible with both 5.56 AND .223?
Matthew H on Nov 24, 2018
BEST ANSWER: Yes it is. My son bought this upper for a build we did together. Functions great and very light for him. You will also get the lighter recoil due to the mid length gas system.
Are the included MBUS sights plastic or steel?
Patrick L on Oct 19, 2019
BEST ANSWER: They’re the regular plastic MBUS sights, not the PROs
Is there a lower accessory rail?
James W on Aug 12, 2018
BEST ANSWER: No, just the top rail. The 3, 6, and 9 o’clock postitions are Mlok, and there are plenty of those to mount just about everything you could.
Is this a free float barrel?
Aamir A on Oct 17, 2019
How's reliability of this upper and what moa are you averaging?
Nicole belik on Sep 20, 2018
BEST ANSWER: I have over 1000 rounds through this beast. Tried many different bullet style/weights. With 55 grain Fiocchi I average 2 moa. With 77gr Federal Gold Medal Berger, I average 1 moa. I have shot several 5 shot groups that are sub .75 inches, and one group that was .57 inches. This is from a bipod using a Primary Arms 1-8x scope.
Difference between this and SKU 516447592 ?
Evan D on Dec 6, 2018
BEST ANSWER: That sku isn’t coming up. What’s the name of the product?
Can a complete ar15 upper be shipped to california??
Bigmike on Nov 7, 2018


4.8 / 5.0
35 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Perfect, Work Horse
This is a great lightweight upper, loved that it came ready to rock and roll. Great buy and I’m glad I recommended it to some friends when I did because now we all have identical rifles. Thanks PSA!
User submitted image
Added Aug 30, 2019
August 30, 2019
8 months ago
Very light weight compared to my 18" steel barrel AR
August 1, 2019
3 months ago
PSA made the purchase easy and simple.
Great choice very satisfied with my purchase. It a modern version of my old M-16 rifle.
July 5, 2019
5 months ago
Broke the seal.
Absolutely love the upper. I added a LER scope which helps with my glasses. It’s extremely reliable and on point.
User submitted image
User submitted image
User submitted image
March 6, 2019
1 year ago
Runs and looks great
Love the look. Nice durable finish. Ran great. Not bad for my first build.
User submitted image
Added Feb 14, 2019
February 14, 2019
10 months ago
Love it!
Haven't had the opportunity to shoot it very much ,but like it alot so far.
February 8, 2019
9 months ago
Love it....!!
Very sweet set up with RITON optics
User submitted image
Added Feb 8, 2019
February 8, 2019
9 months ago
Great upper!
So far I am very happy with the upper. I got this for my first ar build. The finish was great on it and everything moves nice and smooth on it. It fits nice and tight on my lower with no play anywhere. Went to a friends shooting range and put 90 rounds through it and had 5 or 6 times it didn’t want to feed a bullet in but a pull back on the charge handle and would pop it in and was good to go again. Figure it is new and tight and will come out of it the last mag feed all 30 without issue.
All done and assembled
All done and assembled
February 7, 2019
9 months ago
Palmetto delivers
What a deal for a complete upper. Price and performance. No issues noted, 55 and 77 grain reloads function fine.
Ended up putting a Vortex Strike Eagle 1-8x and a Miculek brake on the upper. 

Good job PSA
Easy center hits at 200 yards.
Fifty yard sight in.
January 21, 2019
11 months ago
Best value for the money that I paid will buy again I recommend you do the same reviews.
September 7, 2018
1 year ago

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