PSA 8.5" Pistol-length 5.56 NATO 1/7 Nitride 7" M-Lok Railed Upper With BCG & CH - 516446478

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PSA 8.5" Pistol-length 5.56 NATO 1/7 Nitride 7" M-Lok Railed Upper With BCG & CH - 516446478


Quick Overview

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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.

SKU: 516446478
UPC: 516446478
MFR#: 516446478

Barrel Length: 8.5"
Gas System: Pistol Length
Barrel Profile: A2 Style
Barrel Steel: 4150V 
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 7" M-Lok Free Float Rail
Bolt Carrier Group Included: Yes
Bolt Steel: Carpenter 158
Bolt Carrier Profile: Full-Auto
Charging Handle Included: Yes
Overall Length: 17"

Add To:

Barrel: 8.5" Chambered in 5.56 NATO, with a 1:7 twist rate, M4 barrel extension, and a pistol length gas system. This barrel is nitride treated for accuracy and durablility. It is finished off with a PSA 7" M-Lok free-float rail, .750" diameter low profile gas block, and an A2 flash hider.

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

SKU: 516446478
SKU 516446478
Brand Palmetto State Armory
Daily Deal No
Daily Deal Expires No
Youtube Video No
Free Shipping? Yes
SKU: 516446478

Questions and Answers

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Best buffer weight and spring to use?
Jesse on Jun 20, 2018
BEST ANSWER: In my experience. The best buffer weight would be an hH2buffer. It made mine cycle both .223 and 5.56. Before the h2 replacement it only cycled .223. The spring shouldn't matter too much as long as it's for a carbine.


4.5 / 5.0
10 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Great price and good service
July 22, 2018
1 month ago
psa 8.5 5.56
Super accurate with GGG GP21 62 grain 5.56 and MK318 62 grain 5.56 SOST. only criticism is gas block screws have no alignment/lock holes in barrel. cheapest on otherwise superb product at a truly outstanding price.
July 22, 2018
1 month ago
It is as me and very accurate thank yoy
July 22, 2018
1 month ago
Nice pistol upper
Good quality at a good price. Would buy again.
July 21, 2018
1 month ago
Great deal for both the upper and lower.
Added the PSA lower with flip up sights and the newer sightmark light/ laser. Shoots great.
Added the PSA lower with flip up sights and the newer sightmark light/ laser. Shoots great.
July 21, 2018
1 month ago
Excellent very nice. Shoots well better than expected accuracy for 7.5" barrel. Nice price! Can't beat it.
July 21, 2018
1 month ago
Will not shoot a group. It works great as a noise maker and fire ball maker.
The quality of this upper is nice and the finish looks wel done. Everything is what you would expect as far as looks and it function with zero stopages. it is over gassed so plan on buying a H3 buffer to correct the dwell time. I woudl absolutely love this pistol if it was capable of shooting better than a best overall group of 5.5 MOA WITH MATCH AMMO ONCE. this should shoot 4 MOA with M855 all day. i believe i have a deffective barrel myself. I went out and spent a lot of money on an optics and had some real plans for this yet i can shoot better groups with my smoothbore 12ga with slugs. I have been building AR15 variants for 10 years+ and was even sponsered t0 shoot at camp Perry. I installed my match scope and mount and my bipod from another rifle and this kit has an issue. I tried to figure out how to return it without the receipt. I am moving next month and the receipt must have just got thrown away. If this upper shot groups like it should "im not asking the world of it afterall" I would absolutely love this little thing. I put a single point sling mount, a vortex sparc II and a "brace" and its exactly what i wanted. it just feels like it is a smooth bore. i try one more time and see if they will look at it. if it shoots around 4MOA with xm193 at 100 yards I am very happy with that. I guess I will see how PSA's costumer service is which will aslo let me know if I ever buy from them again. Maybe it was one that got by them and they will replace it and all will be well.
June 21, 2018
Response from Palmetto State Armory
We do apologize for that. Since all of our parts and firearms are covered by our Unlimited Lifetime Warranty, if you have any issues arise from the craftsmanship of the product, we can either have select parts sent to you for you to replace, or we can have the item brought in, at no cost to you, so we can repair or replace the defective product. Please contact Customer Service so we may resolve this issue.
June 22, 2018
Casey S
Fantastic. Very impressed!! Quality all around!!
May 12, 2018
4 months ago
I have had no problems with this in my build. Would definitely repurchase
I have shot about 200 rounds with no ejection issues out of this. Although it does seem a bit over gassed but that might just be because it is so short
May 9, 2018
4 months ago
Excellent Product
Excellent Choice. I highly recommend this product. Everything worked flawless and the quality was excellent
April 28, 2018
8 months ago

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