16" Mid-length upper with mbus rear sight

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PSA 16" Mid-Length 5.56 NATO 1:7 Nitride 13.5" Lightweight M-Lok Upper With MBUS SIght Set - No BCG or CH- 5165448509


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

SKU: 5165448509
UPC: 5165448509
MFR#: 5165448509

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
Handguard Type: PSA 13.5" M-Lok Lightweight Rail
Bolt Carrier Group Included: No
Bolt Steel: N/A
Bolt Carrier Profile: N/A
Charging Handle Included: No
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.

Includes:  Magpul® MBUS Sight Set, Black 

**Upper Does Not Include BCG or Charging Hanlde

SKU: 5165448509
SKU 5165448509
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: 5165448509

Questions and Answers

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Browse 14 questions Browse 14 questions and 59 answers
is barrel 4150 vanadium steel?
Vadim S on May 31, 2018
As sold, what does this upper weigh?
GAYLON H on May 30, 2018
BEST ANSWER: 3.25 lbs....around a bout....it still needs a BCG and charge handle added.
But the cut down "non railed" section in the middle of the handguard makes it a bit lighter than a full flat top....by a few ounces.
It is cut for MLok on the top...
Are the barrels attached with permanent locktite on this or all PSA uppers?
H0bbs on May 30, 2018
BEST ANSWER: It will be coated with "antiseze grease", headspaced, and torqued to spec.
No to the loctite....loctite will break down when heated.....🇺🇸
Is this a freedom barrel?
Joshua S on Jul 28, 2018
BEST ANSWER: Hello Joshua. Yws, it is a Freedom barrel.
Can this shoot .223 also?
GhostRider on Jan 13, 2019
BEST ANSWER: Hello GhostRider, yes it can shoot .223. It's chambered in 5.56 which allows .223 without any problems and many guys shoot .223 ammo in their 5.56 rifles because it often can be found cheaper. A Google search will also confirm that 5.56 chambers like this upper has can shoot .223 but NOT the other way around.
Does this have a quick sling attachment?
Usmcras on Feb 23, 2019
BEST ANSWER: If you mean a sling loop, then NO it doesn't. However, if you're referring to a QD sling mount, then YES, there are two QD mounts/holes, one on each side, just forward of the upper receiver.
Does the handguard have an integral QD mount?
Terry S on Jul 23, 2018
BEST ANSWER: Yes, it does. Mine features a QD mount on each side of the rail closest to the receiver.
Is the A2 flash hider permanently attached to the barrel?
EGootz on Mar 3, 2019
BEST ANSWER: No. It is threaded on an can be removed. It can be replaced by other types of flash hiders and/or compensators if desired.
Is the barrel free floated?
James on Jan 19, 2019
BEST ANSWER: Yes it is free float and one-helluva value!!
Is there any known issue with putting this upper on a Ruger AR-556?
William G on Apr 12, 2019
BEST ANSWER: This upper fits better than the Ruger upper that came with the 556 lower. Take down pins aren’t as tight. I use this upper with a double tap trigger and it is blast!
Do they ship with a magazine?
Usmcras on Feb 23, 2019
Is the Gasblock Pinned or does it have set screws? If screws, then is the barrel dimpled for the screws?
BryanPatrick F on Aug 27, 2018
BEST ANSWER: Gas block is attached with set screws on the bottom of the gas block. The barrel is not dimpled.
Is the barrel length 16in including muzzle or not. Want to know barrel length without muzzle since it's not permanently attached it doesn't count towards overall length?
Kyle K on May 30, 2019
I live in California(I know I know -.- lol)Can i buy this part? asking because it comes with a flash hider which is illegal here in cali?
Mendo on Mar 18, 2019


4.8 / 5.0
47 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
I'm a believer!
Purchased this upper assembly not having my expectations too high to use on my Spikes lower build in the meantime since I might SBR it. I've only ran just over 200 rounds through it but no issues or complaints so far. Very accurate. Running a Spikes BCG and Vltor charging handle. Changed the flash hider for a Spikes Comp also. Was so impressed with Palmetto state I went ahead and order a lower and pistil build kit from them.
User submitted image
Added Aug 13, 2019
August 13, 2019
5 months ago
Lightweight and accurate!
Took it to the range twice for sighting in and practice. It has been an absolute joy to shoot, it’s lightweight and as accurate as I am.
I shot many types of junk ammo and all cycled perfectly. Granted, I am only 300 rounds in but I have no reason to doubt it will continue to shoot whatever garbage ammo I can find.
June 11, 2019
4 months ago
Put on a Anderson lower, fit tight with no side to side rock has been flawless through 1000 rounds.
February 25, 2019
7 months ago
Happy Happy Happy Happy
February 15, 2019
1 year ago
Love it.
Super happy with quality and function. M lok grip gets hot while shooting. Can't beat value.
January 20, 2019
8 months ago
Great upper at a great price!
This upper is much better quality than expected for the price, I like everything about it, have only put 20 rounds through it but no complaints. Love the MBUS sight set!
Huge improvement to basic M&P AR
Huge improvement to basic M&P AR
December 1, 2018
9 months ago
Great upper!
This is a nice upper. I don't have a ton of rounds through it yet, however. It is very accurate at 50yds. with 69 grain Sierra Match King.
October 26, 2018
10 months ago
Great upper
Great upper. Got it without BCG and charging handle so I could pick my own. Lightweight yet solid.
User submitted image
User submitted image
October 24, 2018
11 months ago
Very nice and appears well made
I have nothing bad to say about this upper. Fit, finish and function have been top notch.
User submitted image
Added Sep 29, 2018
September 29, 2018
11 months ago
Great upper!
My second PSA upper, getting 2.5' to 3.5' groups using regular crap ammo, thanks again PSA!!
September 17, 2018

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