PSA 16" Mid-Length Pencil 5.56 NATO 1:7 Nitride 13.5" Lightweight M-LOK Upper with Nickel Boron BCG, CH, & MBUS Sight Set - 5165450127

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PSA 16" Mid-Length Pencil 5.56 NATO 1:7 Nitride 13.5" Lightweight M-LOK Upper with Nickel Boron BCG, CH, & MBUS Sight Set - 5165450127


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 (CA Health and Safety Code Section 25249.6).

SKU: 5165450127
UPC: 5165450127
MFR#: 5165450127

Barrel Length: 16"
Gas System: Mid-length
Barrel Profile: Pencil
Barrel Steel: 4150V Chrome Moly
Barrel Finish: Nitride
Chrome Lining: None
Muzzle Thread: 1/2-28
Chamber: 5.56 NATO
Twist Rate: 1 in 7"
Barrel Extension: M4
Diameter at Gas Block: .625"
Gas Block Type: Low-profile
Muzzle Device: A2 Style Flash Hider
Receiver Material: Forged 7075 T6
Receiver Type: M4
Handguard Type: PSA 13.5" Lightweight M-Lok Rail
Bolt Carrier Group Included: Yes
Bolt Steel: Carpenter 158, Nickel Boron
Bolt Carrier Profile: Full-auto 
Charging Handle included: Yes
Overall Length: 24.5"

Add To:

Barrel: 16" 4150V chrome moly vanadium steel, chambered in 5.56 NATO, with a 1/7 twist, M4 barrel extension, mid-length gas system, and a lightweight pencil profile. The barrel is nitride coated and finished off with an 0.625" 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 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 Carrier Group: ToolCraft nickel boron BCG has a bolt made of mil-spec shot-peened Carpenter 158 steel. Gas key is secured with grade 8 fasteners and staked per mil-spec.

Includes: Magpul MBUS Sight Set, Black

SKU: 5165450127
SKU 5165450127
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: 5165450127

Questions and Answers

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Browse 25 questions Browse 25 questions and 88 answers
what type of lower and stock does this come with?
nite f on May 21, 2019
BEST ANSWER: You are kidding I hope. It is just a quality upper. Order your lower separately.
Who makes the hand guard? It says “Made in USA”.
Ladster on Nov 30, 2018
BEST ANSWER: PSA makes their own hand guards.
Are the barrels used stressed relieved?
Billy B on Nov 22, 2018
BEST ANSWER: The barrels are button rifled...part of the process of button rifling is stress relieving the barrel. Accuracy would vary wildly between barrels if this step were not done.
What tools do you need to remove the handguard?
Chipper on Jan 29, 2019
BEST ANSWER: Hex/Allen wrench for the two bolts. Loosen and slide off
Are the iron sights spring-loaded?
Brentsucher on Nov 26, 2018
BEST ANSWER: Yes, press the bottom by the sight and they pop up.

Great sights for the price you can get the set for.
Can you shot both .223 and 5.56 ammo?
Danoo on Jan 29, 2019
BEST ANSWER: Yes, any barrel chambered 5.56mm or .223 wylde will shoot .223rem and 5.56mm out of it. Just don't shoot 5.56mm ammo in a .223Rem rifle.
Can anyone tell me what this weighs as it comes from PSA, nothing added and nothing taken off?
thank you
mikfel on Mar 9, 2019
BEST ANSWER: I personally have 4 of these and have sold many thru my shop, while i have not put one on the scale, i can tell you that they are extremely lightweight and you are not likely to find a lighter 16” upper anywhere.. i handle more ARs than most and these upper are among my favorite due to the weight and surprising accuracy.
If you change the flash hider. Would this spec be legal in CA?
Fred_v on Jan 16, 2019
BEST ANSWER: California at the current moment.
For a Featureless build you would need to remove the Flash Suppresser and go with a Muzzle Brake or a thread protector cap.
Locked Magazine builds can have all the evil features like a Flash Suppresser but you must open the action to change magazine or use an ejection port loader.
Is the gas block adjustable?
Rob R on Dec 3, 2018
BEST ANSWER: No. If it were, the word "adjustable" would be found in front of "gas block" in the product description.
Can the flash hider be removed and replaced ?
Chris M on Nov 19, 2018
BEST ANSWER: I cannot imagine why not. If you have the tools and knowledge, you should be fine.
Would this upper pair with the Freedom line lowers?
Jeff L on Nov 21, 2018
BEST ANSWER: Yes, any mil spec AR15 lower will work.
I bought one of these recently but can not find an end cap that goes with the M-lok. Can anyone refer me to a cap that is compatible?
Starlashin F on Dec 31, 2018
BEST ANSWER: A end cap for a free-float hand guard? You got me there. What is that?
Are the MBUS sights removable?
Changed M on Jun 5, 2019
BEST ANSWER: Yes. You will also have to install them in the first place and can remove them if necessary.

I installed the ones that came with my upper and then added a Red Dot Sight and a 3X magnifier for cowitness.
Does it fit all AR lowers?
Kurt M on May 29, 2019
BEST ANSWER: I dont see why not. They are made to go on mil spec lowers. They all should line up brother
Does this upper come with a gas tube?
Eggegg on Mar 9, 2019
BEST ANSWER: Yes it comes with a gas tube. Infact it is ready to shoot once you install it on your complete lower reciever.
Will this upper fit with JD Mchine lower?
Hank G on May 30, 2019
BEST ANSWER: As long as you have a mil-spec lower this upper will fit
How can I add a front foregrip to this upper?
Brian S on Mar 11, 2019
BEST ANSWER: Easy buy a add on Pickney rail that bolts on to m-lock.. any local gun shop can help you pick it out. Hope this helps
Will this upper work on a Ruger 556 lower?
Louis G on Jan 11, 2019
BEST ANSWER: Should fit just fine.
Who made the upper, there are no fordge markings??
Richard W on Dec 23, 2018
BEST ANSWER: Palmetto State Armory
What type of barrel is this? Freedom, premium, neither? P.s. I'm new to PSA
Trham on Jun 4, 2019
Can you get this with the non full-rail lightweight handguard?
Tim J on May 31, 2019
BEST ANSWER: I haven’t seen any packaged that way. I own two of these uppers and both came with the full rail.
Do you make this in a left handed model?
Brendan K on Mar 9, 2019
does this barrel assemble have a brass deflector?
Tom M on Jan 18, 2019
BEST ANSWER: Tom, do you know what a brass deflector looks like? Look at the picture.
Will this upper fit with JD Mchine lower?
Hank G on May 30, 2019
Can this be shipped to Maryland?
Ian C on Mar 11, 2019


4.6 / 5.0
69 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
firing pin snapped in half
Seems very good quality. No wiggle at all between my psa lower and this upper. Fit and finish good also. However my firing pin snapped in half with only 150 rounds. I've seen firing pins breaking the tip but never snapping in half. Not sure why it happened but not happy at all. Makes me question the quality of the metals used.
May 28, 2019
Response from Palmetto State Armory
We do apologize for that. Please contact Customer Service so we may resolve this issue.
May 28, 2019
Casey S
Built for a jeep rifle to when we go roam abouts put 500 rnds and good to go light and dependable on a bcm lower heck of a good little setup
May 21, 2019
3 months ago
Wanted a lightweight upper and was not disappointed, great quality at a great price.
May 17, 2019
3 months ago
nice light weight
With my Nikon 223 3x scope it weighs in at 7 pound. It makes a nice walking gun.
May 16, 2019
3 months ago
Lightweight and performance.
This lightweight upper is yet another example of Palmetto's great value for cost. I mated this upper with a Palmetto MOE lower, for a super-light build I was making. Of course, right-out-of-the-box, this upper was flawless and accurate. Fit and finish rivals any other, at even at twice the price. Amazingly the 'pencil' barrel shoots like any regular M4 mil-spec barrel (I shot video at 1000 fps, with almost no barrel-flex at all.)

Doesn't cool as quickly as an M4, but for the weight, uou can't beat it. Very satisfied all-around.
May 16, 2019
3 months ago
5 Stars!
Amazing! Buy it and then buy it again!
May 15, 2019
3 months ago
Great price, impressed with the quality inn relation to price!
Very happy with all my purchases so far from PSA.
My first ever build, PSA 5.56 NATO Upper, all Anderson Manufacturing lower and lower components.
My first ever build, PSA 5.56 NATO Upper, all Anderson Manufacturing lower and lower components.
May 10, 2019
3 months ago
Light weight carry.
Upper was just what I was looking for in a light weight unit.

Look and finish are excellent as with all Palmetto products.

The nickel boron bolt and carrier will make cleanup a snap.

Would recommend Palmetto to anyone.

Great products!!!!
May 10, 2019
3 months ago
Excellent bang for the buck!
Excellent quality at an affordable price. Highly recommend the Nickel Boron bolt carrier group. Makes cleaning much easier and provides slick operation. Shipping was a little slower than I wanted, but chalk that up to popularity of this item combined with my impatience on getting a new toy😂!!! Would definitely recommend this to anyone in the market for a quality lightweight upper group!
May 8, 2019
3 months ago
Would have been 5 but..
Gas block was loose when I got it but other than that it’s been great.
User submitted image
Added May 7, 2019
May 8, 2019
3 months ago

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