Like our stainless steel-barreled upper assembly, but planning to flip your rear aperture to 3-8? Going to use a heavier round? Then let us come through for you this time too. Check out the 1:8 variant of our stainless steel-barreled upper assembly. This piece of eye candy's got all the performance and accuracy of our 1:7 version with its .223 Wylde-chambered barrel, but with a higher twist rate to account for heavier loads or stretching out the range of your shooting. 1:8 is the sweet spot.
Just like our 1:7 version, this AR-15 upper assembly has a lightweight 13.5″ MLOK free-float handguard. In addition to its top rail, the handguard has a row of MLOK space on the bottom and one on each side a well, which gives you the space to mount tac lights, lasers, forward and vertical grips, or whatever else you can think of. Mount this upper assembly to your lower assembly, and add backup sights of your choosing. As with our 1:7 version, this upper assembly is chambered in .223 Wylde, so it's made to fire both .223 and 5.56mm NATO rounds.
AR 15 UPPER ASSEMBLY SPECS:
Gas System: Carbine-length
Barrel Profile: M4
Barrel Steel: 416R
Barrel Finish: Stainless steel
Chrome Lining: No
Muzzle Thread: 1/2×28
Chamber: .223 Wylde (accepts both .223 and 5.56mm)
Twist Rate: 1:8
Barrel Extension: M4
Gas Block Size: .750″
Gas Block Type: Low-profile
Muzzle Device: A2 Flash hider
Receiver Material: Forged 7075 T6
Receiver Type: M4
Handguard Type: 13.5″ lightweight M-Lok free float
Bolt Carrier Group Included: Yes
Bolt Steel: 9310 steel, magnetic particle inspected
Bolt Carrier Profile: Full-auto
Charging Handle Included: Yes
Benefits of the 16” Carbine-Length SS AR 15 Upper Assembly:
- 100% legal to own and ship to your front door
- Not considered a firearm – no FFL paperwork needed!
- 416R stainless barrel and Freedom parts kit ensure sub-MOA accuracy
- Prebuilt upper with gas system removes the guesswork of rifle making
- Includes bolt carrier group, free-floated M-Lok handguard and lower parts kit
AR 15 Upper Assembly Details (Expanded):
Barrel: 16″ carbine-length stainless steel, chambered in .223 Wylde, 1:8 twist rate, .750″ low-profile gas block, 13.5″ free-float M-Lok handguard, with an A2 “birdcage” flash hider.
Upper Receiver Assembly: Forged from 7075 T6 aluminum, hard-coat anodized in black for durability, features M4 feed ramps, and are made in the USA.
Bolt Carrier Group: The bolt carrier is made from 9310 steel and has a staked gas key and black nitride finish. The bolt itself comes complete with an extractor spring and O-ring insert. It accepts .223 Wylde, 5.56mm, and .300BLK calibers (though you should NEVER attempt to use a caliber for which your rifle is not chambered), and is magnetic particle inspected.
Charging Handle: Standard size, made from 6061 aluminum.
Please note: This build kit requires that the builder complete the 80% lower receiver themselves, but that’s the rewarding part of the experience (and the only way to build your own AR-15 without the need of an FFL transfer or serialization).
AR-15Lowerreceivers.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally. Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website. We try our best to keep our shipping page current, but laws change daily.