PSA 10.5" Carbine-Length 5.56 NATO 1/7 Nitride 12" Slant M-Lok MOE EPT SBA3 Pistol Kit with MBUS Sight Set & Romeo 5

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PSA 10.5" Carbine-Length 5.56 NATO 1/7 Nitride 12" Slant M-Lok MOE EPT SBA3 Pistol Kit with MBUS Sight Set & Romeo 5

In stock

Special Price $ 599.99

Regular Price: $ 989.99

Quick Overview

It is the customer's responsibility to be aware of all applicable laws and regulations regarding the purchase and ownership of uppers with a barrel length of less than 16". Federal NFA regulations are applicable to this item.

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: 5165491141
UPC: 5165491141
MFR#: 5165491141

Barrel Length: 10.5"
Barrel Profile: A2
Gas System: Carbine-length
Barrel Steel: 4150V Chrome Moly Vanadium
Barrel Finish: Nitride 
Chrome Lining: No
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: PSA Fluted Flash Can
Receiver Material: Forged 7075 T6 Aluminum
Receiver Type: M4
Handguard Type: PSA 12" Slant End M-Lok Rail
Bolt Carrier Group Included: Yes
Bolt Steel: Carpenter 158
Bolt Carrier Profile: Full-auto
Charging Handle Included: Yes
Overall Length: 21"
Build Kit: MOE SBA3 EPT Pistol Kit, Black
Optic: Sig Sauer Romeo 5 Red Dot Sight

Add To:

Barrel: 10.5" 4150V Chrome Moly vanadium steel, nitride treated for durability and chambered in 5.56 NATO with a 1 in 7" twist. Carbine length gas barrel is finished off with a PSA 12" Slant End M-lok Rail, a low profile gas block and a PSA Fluted Flash Can.

Upper: Forged 7075-T6 A3 AR upper is made to MIL-SPECS and hard coat anodized black for durability. Featuring a mil-spec finish, these uppers are made for us right here in the USA by a mil-spec manufacturer.

Flash Can: Palmetto State Armory's Fluted "FLASH CAN". This is a solid 6061 aluminum device that is designed to direct muzzle gases and the muzzle flash forward. Threaded 1/2-28 for 5.56 NATO. Black military-style hard anodizing. THIS DEVICE IS NOT DESIGNED TO REDUCE RECOIL, MUZZLE RISE, OR FLASH SIGNATURE. This device is designed to direct gasses and noise forward away from the shooter and enhance the weapon's appearance.

Bolt: Bolt is made of Mil-spec shot-peened Carpenter 158 steel. Gas key is secured with grade 8 fasteners and staked per mil-spec. 

Build Kit: A high quality lower build kit with everything you need to assemble your AR-15 lower into a pistol. Features Enhanced Polished Trigger (EPT), Magpul Grip, Magpul Trigger Guard, and black oxide coated hammer and trigger springs. Also includes SB Tactical SBA3 Adjustable Pistol Brace, castle nut, latch plate, carbine buffer spring, 5 positioning mil-spec buffer tube, and standard carbine buffer.

Sig Sauer Romeo 5 Red Dot Sight:

ROMEO5 compact red dot sights provide civilians and armed professionals a robust 1x aiming solution for any situation. Ultra-low parallax so point-of-aim is point-of-impact and the red dot remains parallel to the bore of your firearm, no matter what your viewing angle is relative to the optical axis of the sight. Unlimited eye-relief allows you to acquire the aiming point and the target regardless of the position of your eye behind the sight. The readily available CR2032 battery is side-loading, allowing for quick battery replacement (featuring 50,000+ hours or more of life). Dependable waterproof (IPX-7 rated for complete water immersion up to 1 atmosphere) and fog-proof performance.


  • -2 MOA Red-Dot provides 10 illumination settings (8 daylight plus 2 NV) for visibility in all light conditions
  • -MOTAC™ (Motion Activated Illumination) powers up when it senses motion and powers down when it does not. Provides for optimum operational safety and enhanced 50,000+ hour battery life
  • -Integrated M1913 Picatinny interface provides industry-standard mounting options for a wide range of applications
  • -Dependable waterproof (IPX-7 rated for complete water immersion up to 1 meter) and fog-proof performance
  • -Includes a M1913 Picatinny low mount riser and a co-witness 1.41” riser mount
SKU: 5165491141
SKU 5165491141
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: 5165491141

Questions and Answers

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Browse 26 questions Browse 26 questions and 66 answers
Does anyone know what the diameter inside the rail is? I'm wondering if a SilencerCo Hybrid can will fit since the rail goes past the end of the barrel.
Sean on Oct 22, 2019
BEST ANSWER: I have 1 3/16
Is this legal to ship to New Jersey??
Guy P on Oct 19, 2019
BEST ANSWER: Is it legal to ship to california?
Does this require a federal stamp to legally own?
Stacy W on Nov 8, 2019
What is the inside diameter of the forend?
D B on Oct 16, 2019
What is the difference between this kit and the kit that comes with 10 magazines?
Eric v on Nov 6, 2019
PSA 10.5
PSA 10.5" Carbine-Length 5.56 NATO 1/7 Nitride 12" Slant M-Lok MOE EPT SBA3 Pistol Kit with MBUS Sight Set & Romeo 5
PSA 10.5
PSA 10.5" Carbine-Length 5.56 NATO 1/7 Nitride 12" Slant M-Lok MOE EPT SBA3 Pistol Kit w/MBUS Sight Set, NiB BCG, & Sparc + 10 PMAGS
BEST ANSWER: The one with 10 mags has a Vortex Sparc red dot and a Nickel Boron BCG
Do I need to use a PSA lower for the parts kit or can I use any lower I want?
Arturo L on Oct 23, 2019

Hello, we can only guarantee our parts will work with our receivers. However we design these kits to be installed on Mil-spec receivers.

Best Regards,
Palmetto State Armory Customer Service
Does this pistol kit comes with everything?
Jarhead75 on Oct 10, 2019

It comes with everything to build a complete pistol except the lower receiver. That must be purchased separately.

Best Regards,
Palmetto State Armory Customer Service
will this upper fit on a .223 lower?
Brian A on Jan 10, 2020
BEST ANSWER: It is a Mil spec upper. It will fit Mil spec lowers for AR15 rifles/pistols. .223 versus 5.56 only affects the upper.
Will it fire .223?
Chris on Jan 21, 2020
BEST ANSWER: Yes it will fire . 223. And you will be very pleased with this setup. It shoots very smooth and it has a dam good look to it. I am glad I bought it. I plan to build the same format with a 16"barrel.
Will suppressors work with this set up? Looks like the rail might get in the way.
Bobby on Jan 8, 2020
BEST ANSWER: Actually there is a flash hider that can be used that has the threads on the outside . The suppressor screws on that and will work . The website you can purchase these is called wish
Will the PSA AR-15 complete classic pistol lower work with this kit?
Cmasonman on Nov 27, 2019
BEST ANSWER: It will work, but you will have a lot of extra parts. All you really need is a striped lower and the kit comes with everything to build it.
Any way of getting some of the parts in FDE?
Paul T on Jan 17, 2020
BEST ANSWER: That kit came with all black. Some things like grip or different hand guards come in FDE. Customer service is great. I am sure they can help you with other options. Great kit after all
This would be my first build, is there any video tutorial that anyone can share to build it? thanks in advance.
Angel L on Nov 15, 2019
BEST ANSWER: check " pewpewtactical.".... type in... How to build an AR15 Lower... best I have found ! goes step by step
First build!
What tools are neccessary to finish build...?
Have a oil, vise/block, punches and small brass hammer..also purchased Real Avid pivot pin tool... anything else Gents?
AZBobbyBoy on Nov 1, 2019
BEST ANSWER: All you need is a castle nut wrench, flat head screwdriver and a few good specific punches. If you want it done right get a torque wrench and a staking tool
First time im building a gun, is this all i need besides the lower reciever to build one? Or what else should i be looking at to at least get it shooting before upgrades?
Victor M on Oct 27, 2019
BEST ANSWER: You’ll need a milspec lower and magazines of course. That’s it. This thing is already pretty upgraded with backup sights and a polished trigger. Only thing I added to mine was some Magpul slot cover plates and an angled fore grip...
Is the buffer tube pictured correct? 6 position?
Joseph on Oct 21, 2019
BEST ANSWER: Yes. But you only actively can engage five
Does this kit include a stainless hammer and trigger as the picture seems to show?
brendan j on Jan 12, 2020
BEST ANSWER: Yes. It does. The only thing you need is a lower receiver for this kit.
How is the co-witness in this set up? Do the iron sights and the red dot match up well?
Blackbeastent on Nov 22, 2019
BEST ANSWER: Perfectly
What brand is the wrist brace?
Jason C on Nov 3, 2019

This kit has an SB Tactical brace.

Best Regards,
Palmetto State Armory Customer Service
Can i use a high shelf lower with this kit?
WeekendTactical on Oct 17, 2019
BEST ANSWER: The upper is designed and manufactured to MIL-SPECS and therefore, will fit all high or low shelf lowers.
Does this come with the bolt?
Kenneth S on Oct 13, 2019
BEST ANSWER: Bolt Carrier Group Included: Yes
Bolt Steel: Carpenter 158
Bolt Carrier Profile: Full-auto
Does the Romeo 5 red dot come in the same box or ship separate from the pistol kit?
Michael P on Jan 24, 2020
Can i get this set up with the tan brace?
Randy W on Dec 23, 2019
Is the included BCG nitride or phosphate/chrome lined?
J T on Nov 28, 2019
Will this work with an Aero M4E1 lower receiver?
Alex S on Nov 9, 2019


4.7 / 5.0
38 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Love the rifle and the romeo sight, trigger feels great, nickel boron coated.
January 24, 2020
2 months ago
Great home defense penetrator !
January 23, 2020
2 months ago
Great weapon and great service.
Highly recommend buying this build. Very affordable and very well made. Only took an hour to put together after I got the lower. For the price I’m really blown back buy the quality of the gun. Definitely will be buying other kits in my near future.
User submitted image
Added Jan 18, 2020
January 18, 2020
1 month ago
Love it, great fit on lower!
User submitted image
Added Jan 16, 2020
January 16, 2020
2 months ago
The perfect pistol kit!
This is my first AR build, and I can definitely say there's no need to buy one off the shelf anymore. Building is super easy!
I bought this kit on sale in November 2019 and paired it with an Anderson lower I got on black Friday at my lgs. (Waiting for sales is worth it!)
I love that this kit comes with sights, red dot and MBUS. The SBA3 brace and Magpul K2 grip are great furniture!
And the EPT trigger is amazing for a mil spec trigger! There is no creep! It's just like a single stage, but it has about a 6lbs pull. (Just guessing. I don't have a gauge) It's perfect for a home defense or truck gun trigger.
User submitted image
User submitted image
User submitted image
User submitted image
January 14, 2020
Great value for the money easy put together ans make upgrade the scope soon
Great pistol but loud.
January 12, 2020
2 months ago
No malfunctions but poor accuracy.
The pistol cycled fine but did not group very well. The accuracy was not good at all. Very disappointed when compared to another 10.5 inch barrel pistol that I own.
January 10, 2020
2 months ago
Response from Palmetto State Armory
We do apologize for that. Please contact Customer Service with your order number so we may resolve this issue.
January 23, 2020
Casey S Staff
A great pistol setup combo!
Great Magpul, M-Lok, Sig Sauer and SBA parts included. All you need to do is pick a lower and you are off and running to build a sweet pistol.
January 4, 2020
3 months ago
Great package, though I needed anti-walk pins for the trigger and hammer.
Everything has functioned very well and it assembled without issue. The only detractor is that the trigger pin walks out when fired so that the trigger becomes disconnected. Once I installed anti-walk pins, everything was flawless.
January 4, 2020
2 months ago
Near perfect for anyone experienced or new to guns.
Completely satisfied. I matched this with a locally made Alex Pro Firearms lower. Went to the range with a close buddy of mine and we shot over 500 rounds in mine alone with no jams or misfires misfeedings. We also shot his PWS 7.5" pistol and i can tell the difference but it isn't by much. Performance wise this pistol was a steal. I originally purchased this during the Halloween sale for $49o before taxes. I personally enjoyed the building experience. Couldn't be happier.
Photo barely does justice.
Photo barely does justice.
January 3, 2020
2 months ago

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