16" AR 15 Build Kit with MBUS

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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

In stock

Regular Price: $ 739.99

Special Price $ 399.99

Quick Overview

free shipping Free Shipping applies to this item only and not the entire order.

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
  • Barrel Marking: "5.56 NATO 1/7 FREEDOM"

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Barrel: 16" 4150V Chrome Moly Vanadium steel  Freedom 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. Roll mark on barrel reads "5.56 NATO 1/7 FREEDOM"

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
Free Shipping Qty Label No
Free Shipping Qty No
SKU: 516446780

Questions and Answers

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Browse 77 questions Browse 77 questions and 144 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 contacted PSA customer support and they confirmed that these are headspaced and test-fired to ensure proper functioning. It's ready to go.
Can this kit be shipped to ny without an ffl?
Shane M on Apr 28, 2018
I would like to know the difference between the standard mil-spec AR15 barrel and the Freedom barrel?
T E on Jul 4, 2018
BEST ANSWER: “Mil-spec” would be carbine length gas system. These are mid length.
Are the bolts marked MPI or HPT?
fieldfly f on Apr 12, 2018
BEST ANSWER: these bolts have the Magnetic Particle (MPI) stamping.
Does this product ship to Ca??
Freddy on May 1, 2018
Is this a quality stock...will it rip my beard hairs out?!
Joshua S on Jul 28, 2018
What is the difference between M-Lok Classic, M-lok MOE EPT, and M-Lok MOE+ EPT?
Kevin H on Feb 5, 2019
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PSA 16" 5.56 NATO 1/7 Mid-Length 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
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PSA 16" Mid-Length 5.56 NATO 1:7 Nitride 15" Lightweight M-Lok Classic Rifle Kit With MBUS Sight Set
PSA 16
PSA 16" 5.56 NATO 1:7 Midlength Nitride 13.5" Lightweight M-Lok MOE EPT Rifle Kit w/ MBUS Sight Set
PSA 16
PSA 16" Mid-Length 5.56 NATO 1:7 Nitride 13.5" Lightweight M-Lok Classic Rifle Kit w/MBUS Sight Set
BEST ANSWER: "MOE" stands for Magpul Original Equipment which describes the style of hand guard and rails that make up the rifles accessory platforms. "M-Lok" describes the shape of the slots for attachments. "EPT" stands for Enhanced Polished Trigger which defines that the trigger will be smoother and maybe will reduce trigger pull pressure due to the fact it has polished parts that reduce friction. So, with all this said, I picked the M-Lok MOE style and only purchase accessories that are compatible with this platform on all my ARs so that I can swap things around. I hope this helps.
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.
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.
I was just wondering, with this kit, is it everything i need to put it together, or do i need anything else, this is my first one, an dont want to get it wrong?
mustang8750 on Jul 14, 2018
BEST ANSWER: Short answer: includes everything EXCEPT a lower reciever.

hey buddy, I was in your shoes just a few years ago, the first build can be a little daunting. This is a great build, I’ve used it a few times. Most online builds (including this one) will need you to still purchased a Striped Lower Reciever to become operational. I recommend Anderson Arms Lowers as they are reliable and some of the cheapest on the market today. The lower parts kit included in this built kit will then go in your lower reciever.
There is another kit the same as this one but with a carbine gas system. So whats the difference mid length vs carbine gas system?
Kevin G on Jan 23, 2019
PSA 16
PSA 16" 5.56 NATO 1:7 Midlength Nitride 13.5" Lightweight M-Lok MOE EPT Rifle Kit w/ MBUS Sight Set
PSA 16
PSA 16" M4 5.56 NATO 1/7 Carbine-Length Nitride 13.5" Lightweight M-Lok MOE EPT Rifle Kit With MBUS Sight Set - 516447430
BEST ANSWER: This is all based on reading, but the answer that I get is that the mid-length gas system will probably have a little less recoil due to less gas pressure pushing the bolt back, but sufficient pressure to cycle. I also read that carbine length seems better for full-auto or an adjustable gas block. I'm getting 16" mid-length.
Can this be shipped to California?
Carlos V on Jun 5, 2018
BEST ANSWER: Yes, you will just need to replace the parts that are not allowed on a featureless rifle if you wish to build one
Im a little confused on what else is needed to complete this rifle im very new to the gun world but i think its the trigger what kind do i need please help?
Wilfer C on Dec 12, 2018
BEST ANSWER: You only need a stripped lower receiver, some specialized tools make putting it together easier, but they are not necessary. Everything else to make it functional is provided.
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.
Can you use .223 ammo with this rifle or just 5.56?
bcowboi on Aug 4, 2018
BEST ANSWER: You can use both
It it hbar or does it have a pencil barrel?
Wyatt B on Jul 27, 2018
BEST ANSWER: This comes with an "A2" profile barrel. See the picture below... I hope this helps you.
PSA 16
PSA 16" Mid-length A2 Profile 5.56 NATO 1:7 Premium Barrel - 12117
What charging handle is in this upper?
Ryan H on Jul 24, 2018
BEST ANSWER: Standard military style charging handle, non-ambi. I am lefty and don't have a problem, just takes some time to get used too.
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.

What tools do I need to assemble?
B B on Sep 6, 2018
Is the hand guard polymer or metal?
Matt H on Dec 27, 2018
BEST ANSWER: It's an aluminum hand guard.
what will I need to complete rifle?
james b on Mar 7, 2019
BEST ANSWER: The only part with serial numbers. You will need a striped lower. You can get one at almost any gun store with a background check. Also you will need the tools and knowledge to complete your build. knowledge can be found from a friend or YouTube. The tools are very basic. A small hammer some punches and a AR multi wrench are a good start also a vice helps. Good luck and when you learn please teach others. SUPPORT THE 2A
What lower will work with this upper?
Shotgun on Mar 2, 2019
BEST ANSWER: Any milspec should work. I've been running it on an Anderson lower and it's been perfect.
Will this upper shoot 223 and 556 ?
William H on Dec 26, 2018
BEST ANSWER: Yes 5.56 chambers shoot either, .223 chambers should use .223 only. .223 Wylde shoot either as well.
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 the buffer tube Mil-spec or commercial?
Nathan on Apr 29, 2018
BEST ANSWER: Mil-Spec diameter buffer tube.
Shoots 5.56 perfectly, however 223 jams about every 3rd round... any suggestions or tips?
SHyman on Jan 30, 2019
BEST ANSWER: It is probably an issue with the 223 rounds pressure. I would suggest trying a different brand of 223 and see if the problem persists. Often on reloaded or remanufactured rounds they will also load on the lower end of the spectrum and this can cause performance issues. You could also install an adjustable gas block to compensate for the lower pressures of the 223 you may be using.
What front grip works with this rifle?
Dontae O on Feb 17, 2019
BEST ANSWER: Any front grip that uses the M-Lok style mounting system will work with this kit.
Does it come with an extra spring and detent?
Dontae O on Feb 16, 2019
BEST ANSWER: Yes, every kit I’ve bought has had an extra spring and detint.
Will this work with any AR-15 lower?
Taylor on Feb 3, 2019
BEST ANSWER: These parts are made to MIL specs which means they are interchangeable. So yes, if the lower is to MIL spec the upper will work.


4.8 / 5.0
217 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Great Upper reciver.
Cycles Any ammo I’ve put through it so far, I’ve put almost 2000 rounds through it and I haven’t had it jam once. It’s also quite accurate.
March 19, 2019
Functioned flawlessly.
March 19, 2019
2 months ago
Easy assembly pleased so far
March 19, 2019
1 month ago
Could have done better considering the time it took to get shipped but still happy to finally get my stuff..
Ordered this kit on March 8 now it's the 18th... took a few weeks but I'm fairly happy with what I recieved the bcg doesn't seem to be chrome lined in the gas key nor is there any mpi stampings to clarify if its magnetic particle inspected, the pin to hold the dust cover is way over sized but that's not as much as a problem as the bolt carrier not being stamped hope to get a response from palmetto.
March 18, 2019
Great deal .. Fast shipping !!!!!!
User submitted image
User submitted image
March 16, 2019
1 month ago
The segmented parts bags aided in assembly
March 15, 2019
2 months ago
Great product
Fast shippingand the quality is better than what I was expecting
March 15, 2019
2 months ago
Very happy with this purchase.
Very nice rifle. This is my first AR and I’ve had no issues so far.
March 14, 2019
2 months ago
Impressive Rifle
Great build! Smooth assembly. Fires flawlessly with nice accuracy. A great platform to customize.
Added rail and Leapers UTG forward grip with deployable bipod.
Great builds from PSA.
March 9, 2019
2 months ago
Unbeatable deal!
Very nice upper and accessories. Still customizing the build. Shoots rather well and was a flawless project with absolutely zero hiccups.
Sorry for the comforter background
Sorry for the comforter background
March 7, 2019
2 months ago

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