PSA 16" Mid-Length 5.56 NATO 1/7 Nitride 15" Lightweight M-lok Upper - With BCG, CH, & MBUS Sight Set - 5165450021

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PSA 16" Mid-Length 5.56 NATO 1/7 Nitride 15" Lightweight M-lok Upper - With BCG, CH, & MBUS Sight Set - 5165450021


Quick Overview

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SKU: 5165450021
UPC: 5165450021
MFR#: 5165450021

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 15" 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 15" 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.  Includes Charging Handle.

Includes:  Magpul® MBUS Sight Set, Black 

SKU: 5165450021
SKU 5165450021
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: 5165450021

Questions and Answers

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Browse 9 questions Browse 9 questions and 8 answers
Is the barrel 4140 or 4150?
Ben B on Nov 8, 2018
BEST ANSWER: PSA customer support told me that this has a 4150v barrel
Is this upper a good match on a Colt LE6920 ?
Fred S on Dec 26, 2018
BEST ANSWER: I don’t own a 6920 but it fits just fine on any of my milspec lowers. I’m sure the function will be just fine and I’ve never had a fit issue with any psa upper. I can’t speak on the tone of the finish or color if that matters to you.
Does this upper come with the premium full auto BCG ?
Aaron S on Dec 30, 2018
BEST ANSWER: No, it’s a very basic BCG
Does it come with the bolt and charging handle ?
Omaraudi on Dec 2, 2018
Is that a QD point on the rail?
Lorenzo F on Nov 12, 2018
BEST ANSWER: Yea that should be a QD point if you're talking about that spot three or so inches right of the ejection port in the picture.
As there doesn't appear to be a lower picatinny rail, what are the mount options for the underside so I could use something like a bipod?
Tim O on Dec 31, 2018
BEST ANSWER: Yes, with the instal of a rail using M-LOK. Sold separately.
Whst is the torque spec for handguard hex screws attaching it to the barrel nut?
Mike M on Dec 29, 2018
Thanks for all your answers, this is the Old Man Fred S, I'll grab one while I can. Happy New Year ?
Fred S on Dec 26, 2018
I just purchased this barrel. Which base for my scope works best, and I have to keep in a budget? I have a quick disconnect for my scope but require 4 screws. Is there a place on the barrel to accept this, or does it have to attach to rail?
W A on Dec 24, 2018


4.3 / 5.0
3 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Very Good Upper at an Excellent Price
This upper has been 100% reliable during my initial test firing, including with steel-cased ammunition. Accuracy has been good for an iron-sighted carbine, although I have only shot it at an indoor range where the max range is only 25 yards. Parts quality is good, and assembly is solid. This upper also looks very nice to my eyes. Overall, I have been impressed with this upper, and the price is hard to beat. I would recommend this upper to anyone considering one of this configuration.
Initial Unboxing
Initial Unboxing
December 20, 2018
Really looked forward to this upper.
The good:
It’s solid with a nice finish.
The bad:
Looks like some parts have been used. (Copper marks on feed ramps.)
What appears to be rust on the ejection port cover. And my biggest gripe, the poor excuse for a staked gas key.

Had it for two days. I have yet to fire it. Dry packing was expected but it’s gardly a smooth action even with generous lubrication. The bolt does not move freely by hand in the carrier as it should. Has a resistance while charging it.
Overall I believe it will function fine.
December 7, 2018
1 month ago
Great upper!!!
Excellent quality and looks so much better in person! Everything works smoothly!
User submitted image
Added Nov 17, 2018
November 17, 2018
2 months ago

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