AR-15 5.56/.223 20" Stainless Steel Spiral Fluted Tactical Upper Assembly with M-LOK Rail

20" 5.56 Upper: Specs & Features

Enhance your AR-15 build with the 5.56/.223 20" Stainless Steel Spiral Fluted Tactical Upper Assembly. This upper features a high-performance 416 stainless steel barrel with a spiral fluted design for reduced weight and improved cooling. The 1-8 RH twist and 6-groove button rifling provide exceptional accuracy for both 5.56 NATO and .223 Remington cartridges. It also includes a M4 feed ramp for reliable cycling. The upper is paired with a 15" free-floating M-LOK handguard for superior accessory mounting and durability.

Note: This upper assembly does not come with a BCG (bolt carrier group) or charging handle, but they can be purchased separately.

Features:

• Barrel: 20" 416 Stainless Steel HBAR barrel with spiral fluting for weight reduction and heat dissipation.
• Barrel Specifications: Hardened to 26-32 RC and stress-relieved for long-lasting durability. Threaded 1/2x28 with an Xtreme Triport Muzzle Brake in nitride and a crush washer.
• Chambering: 5.56 NATO – Compatible with both 5.56 NATO and .223 Remington rounds.
• Twist Rate: 1:8 RH twist, 6-groove button rifling for improved accuracy and versatility.
• Gas System: Rifle-length gas system with a .750 low profile gas block made from aircraft-quality aluminum and hardcoat anodized.
• Upper Receiver: A3 flat-top upper receiver, made from 7075-T6 aluminum forgings and black hardcoat anodized to government specs. M4 feedramps, forward assist, and dust cover installed.
• Handguard: 15" free-floating M-LOK rail, made from aircraft-quality aluminum and black hardcoat anodized. It allows for easy accessory attachment and enhanced strength.
• Weight: Lightweight and durable construction, optimized for tactical use.

Specifications:

• Barrel Length: 20"
• Barrel Material: 416 Stainless Steel
• Barrel Diameter: .750 under gas block
• Twist Rate: 1-8 RH
• Muzzle Brake: Triport Nitride Coated
• Upper Receiver: A3 Flat Top, Black Hardcoat Anodized, M4 Feedramps
• Handguard: 15" M-LOK Free Float Rail
• Gas Block: .750 Low Profile, Aircraft Quality Aluminum
• Gas System: Rifle Length
• BCG and Charging Handle: Sold separately
• Images may not be an exact representation of the product.

FAQ

Will this upper fit my AR-15 lower?

Yes. It fits any standard mil-spec AR-15 lower receiver and uses a standard 5.56 bolt carrier group and STANAG/AR-15 magazines.

Can I shoot both 5.56 NATO and .223 Remington?

Yes. A 5.56 NATO or .223 Wylde chamber safely fires both 5.56 NATO and .223 Remington ammunition.

Is a bolt carrier group included?

No. The bolt carrier group is sold separately; any standard 5.56 AR-15 BCG will work.

What twist rate does it use?

A 1:8 twist, a versatile rate for 55 gr to 77 gr bullets.

Related: 5.56 NATO & .223 Wylde AR-15 uppers