PSA 16" 5.56 NATO 1:7 Midlength Nitride 13.5" Lightweight M-Lok MOE EPT Rifle Kit w/ MBUS Sight Set

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PSA 16" 5.56 NATO 1:7 Midlength Nitride 13.5" Lightweight M-Lok MOE EPT Rifle Kit w/ MBUS Sight Set


Quick Overview

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SKU: 516446780
UPC: 516446780
MFR#: 516446780

Barrel Length: 16"
Gas System: Midlength 
Barrel Profile: A2
Barrel Steel: 4150 Chrome-Moly Vanadium
Barrel Finish: Nitride
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" Lightweight M-Lok Rail
Bolt Carrier Group Included: Yes
Bolt Steel: Carpenter 158
Bolt Carrier Profile: Full-auto
Charging Handle Included: Yes
Optics: Magpul MBUS Front and Rear Flip-Up Sights, Black
Fire Control Group: PSA Enhanced Polished Trigger (EPT) FCG
Overall Length: 24.5"
Weight: 4.0 lbs

Add To:

Barrel: 16" 4150V Chrome Moly Vanadium steel barrel, chambered in 5.56 NATO, with a 1:7 twist, M4 barrel extension, and a Mid-length gas system. The barrel is finished with with a .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.

Lower Build Kit:  PSA MOE EPT Lower Build Kit, Black

Includes: Magpul MBUS Sight Set, Black 

SKU: 516446780
SKU 516446780
Brand Palmetto State Armory
Daily Deal No
Daily Deal Expires No
Youtube Video No
Free Shipping? Yes
SKU: 516446780

Questions and Answers

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Browse 14 questions Browse 14 questions and 30 answers
Has the headspace been checked on this barrel and bolt or would I need to get that done if I bought one?
Michael T on Apr 12, 2018
BEST ANSWER: I have bought quite a few complete uppers and lowers from PSA and simply put them together with a complete BCG/CH an fired at range with 0 issues. 300AAC and 5.56 as well as a 18'' 223 wylde. All have been flawless and super quality. PSA is #1 IMO!!! Buy with confidence my friend(s)!
Are the bolts marked MPI or HPT?
fieldfly f on Apr 12, 2018
BEST ANSWER: these bolts have the Magnetic Particle (MPI) stamping.
Can this kit be shipped to ny without an ffl?
Shane M on Apr 28, 2018
Is there a way to add a bottom rail to this upper?
Travis B on Apr 16, 2018
BEST ANSWER: Yes. M-lock's base go into the oval on the hand guard. They twist and lock as you tighten them.
Does this product ship to Ca??
Freddy on May 1, 2018
What lower receiver do you recommend for this upper kit?
Jarod B on Apr 27, 2018
BEST ANSWER: Any AR-15 style stripped lower. PSA lowers have about the best price going, and I’ve built 5 using PSA lower build kits with zero problems.
does this kit come with all of the parts to assemble the lower?
shawn h on May 12, 2018
BEST ANSWER: Yes, this has everything you need to build a complete rifle, except for the stripped lower receiver. Link below.
Is this a complete build or just the upper?
Nick M on May 14, 2018
BEST ANSWER: It is a complete build kit minus the lower receiver. The upper will come assembled.
Is the buffer tube Mil-spec or commercial?
Nathan on Apr 29, 2018
BEST ANSWER: Mil-Spec diameter buffer tube.
Has anyone had any problems with certain Ammo running through this upper?
Matt S on May 11, 2018
BEST ANSWER: No problems so far. Got about 500 rounds through it shooting federal, winchester, hornady and even tula and aside from a few dud rounds of tula everything worked perfectly.
Is it possible to get a lefty version of this?
Jay Wells on Apr 27, 2018
BEST ANSWER: I'm a lefty and used M16s in the infantry. Once you use them a bit it seems like they are more suited to lefties than righties if you change to an ambi safety! Bolt release with trigger finger, mag release with thumb of non firing hand when changing mags. Can't use a left handed AR now. Feels backwards!
Is the barrel mil-spec?
rval093 on May 9, 2018
BEST ANSWER: Yes it is! I’m very well satisfied with this rifle kit.
When will this kit be available again?
Joe P on May 20, 2018


4.9 / 5.0
49 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Love it
Couldn't be happier. PSA even includes an extra detent in all the build kits (because they know you'll probably lose one along the way). Overall a superb product at a great price.
May 27, 2018
1 month ago
2nd build
This is my 2nd build and i'm definately NOT an expert but this rifle has wayyy better parts than my 1st one from midway. Price is good too. Will definately order from PSA again.
May 26, 2018
Amazing great value and great quality when built was the best I’ve ever done no modifications at all went together so beautiful loved it so much also bought a 308 Winchester from you and will always buy from palmetto and only palmetto shipping was fast and on time great job to all of you class act
User submitted image
User submitted image
May 25, 2018
1 month ago
This was my first build, and I am very pleased about it. Quality components, low cost, and it all went together very smoothly! Now, all put together, it looks great, and functions extremely well.
May 25, 2018
1 month ago
Great kit for the money for $500 assembled with iron sights.
Used this for a first time build practice, It is definitely worth it for a complete rifle around $500. This is the first rifle I’ve built (the lower anyway). Definitely recommend the Wheeler kit that includes a bar as/nylon hammer, punches, and the trigger guard roll pin install tool. That tool is worth the whole kit in how easy that pin goes in.

Had some issues at break in with Federal Independence 5.56 for some reason. Either the ammo is a little under powered or the combo of the mid-length gas system, the ammo, and new parts was a perfect storm for failures to feed. Produced my first brass over bolt malfunction, so that was fun Switched to American Eagle 5.56 and didn’t have any more issues.

Handguard walked out on me a little, easy fix though.

The description was a bit confusing for me, I read it as a lightweight profile barrel - this is more M4/govt profile - about the same as my DDM4 V1. Still a pretty light package.

This and the lower shipped quite fast, I had both within the week. Thanks, Palmetto State Armory.
May 23, 2018
2 weeks ago
Way to nice for the money.
If you are looking for a cheap starter. Buy this kit
May 22, 2018
1 month ago
Very nice and received in 4 days
May 21, 2018
2 weeks ago
Badda Bing
Great value and price. You can't beat PSA
For the money you can't beat PSA.
For the money you can't beat PSA.
May 21, 2018
1 month ago
Works like a champ. Great price too
My first AR build. Great price, works great so far, just YouTubed how to assemble everything
May 20, 2018
1 month ago
PSA 16" 5.56 NATO 1:7 Midlength Nitride 13.5" Lightweight M-Lok MOE EPT Rifle Kit w/ MBUS Sight Set
There is no way you can go wrong with this build kit.
PSA always comes through.
PSA always comes through.
May 19, 2018

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