16" 556 NATO Parkerized M4 Barrel AR15 Upper Assembly with 15" Rail and A2 Flash Hider
The 556 NATO (5.56x45) chamber will reliably fire both 556/223 with the highest possible accuracy (223 Remington ammo can be used in 556 NATO barrels). Both rounds maintain supersonic speed beyond 500 yards and equal the accuracy of the benchmark M1 Carbine / M2 30-06 Springfield combination. The 556 NATO cartridge is designed as a lighter alternative to the 7.62x51 NATO that maintains the capability of penetrating 0.135" steel at 500 yards.
- 16" 556 NATO 4150 Chrome Moly M4 Contour Parkerized Barrel with 1x8 Twist and 1/2x28 Threads
- Mil-Spec Upper Receiver forged from 7075 T6 aluminum with forward assist and dust cover assembly installed. Hard coat anodized MIL-STD 8625 Type 3 Class 2
- 15" Narrow Profile Free Float Rail machined from 6061 T6 aluminum Very comfortable and very light weight. Your choice of M-LOK or KEYMOD attachment points along the entire length at 3, 6, and 9 positions. Hard coat anodized MIL-STD 8625 Type 3 Class 2
- 0.750" Low Profile Gas Block
- Carbine Length Gas System
- Mil-Spec A2 Flash Hider with crush washer
This upper assembly will fit all standard AR15 lower receivers.
This item is "Firearm Parts", not a complete firearm (no serialized components). It will be shipped directly to you with no FFL transfer required.
You are responsible for knowing federal, state and local laws applicable to this item. AR15Parts.com reserves the right to not ship to addresses where it may not be legal to own this item.
ReviewsJonathan GrazianoI had tried to pick up an upper from Davidson defense and after 45 days instead of the 27 I was told. I gave up and had my money returned. How is this relevant? well I looked around and nobody had what I wanted or they wanted an insane price for the upper setup. However Ar15Part had what I needed and at a fair and reasonable price. I will be choosing them for all of my AR needs in the future. In addition, I received what I needed in about a week, a far cry from 45 days.Thomas Armstrong
Great Upper Assembly and deal!Fast shipping and I love the upper assembly! Thanks for the great deal y'all. Fits perfectly with the lower I have and looks outstanding.Keith D Russell
16â€ 5.56 NATO AR 15 Stainless Nitride UpperWas shipped very fast opened box & was very satisfied just what I wanted very happy with product will defiantly order from here againBryce Elliott
quickQuick shipping and great parts nothing cheapLucas D
Amazing productOrdered this upper and it’s my first one I’ve ever purchased for my first AR setup. Goes perfectly with my Magpul lower, lightweight and very easy to customize, even light enough for my wife to handle comfortably. Arrived within 3 days of placing the order which was very surprising and impressive! Will be coming back to order more parts and accessories in the future! Product was packed very carefully, no complaints at all very pleasant customer service overall, thank you guys keep it up!Dimitri Frangiadis
First Build -Barrel looks great - looking to build soon and take it to the range - good communication after order/shippingTravis Thorpe
Awesome productQuick shipping all products were packed nice and in premium condition shoots perfect groups niceDylan Stammely
thanksIts amazingKen K.
Happy ShooterPerfect fit on my Custom PSA lower. Nice grouping using .223 and 5.56 55 grain ammo. I liked the fat look of the Cone Brake which is why I went with it. I would recommend any 223 Wylde by AR-15.Kevin B
Great value!I was very pleased with the product. The quality was very much appreciated. As well as the pricing.
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DetailsCurrent Stock: 290SKU: UA55N16PA08M428C_15ML00_A2UPC:Availability: Usually Ships in 24 HoursOld SKU: 16M4SSNU1x8RL