18" Midlength 22 ARC Medium Stainless M-LOK Upper Assembly

18" Midlength 22 ARC Medium Stainless M-LOK Upper Assembly

Precision-crafted to unlock the full potential of 22 ARC.

The 18" 22 ARC M-LOK Upper Assembly is built for shooters seeking cutting-edge small-caliber performance in a precision AR-15 package. It features a premium stainless steel medium-contour barrel, optimized for the high-efficiency burn rate of 22 ARC. The mid-length gas system ensures smooth cycling, reduced port pressure, and enhanced accuracy. A nitrided steel gas block, American-made M-LOK handguard (style may vary), and forged upper round out this complete package. Assembled with Permatex 242 and AEROSHELL 33MS for long-term reliability. BCG and charging handle not included.

Why 22 ARC?
Hornady’s 22 ARC delivers flat trajectories, superior wind resistance, and reliable expansion—ideal for precision shooting and hunting in a standard AR-15 platform. It bridges the performance gap between traditional 5.56 and larger calibers without added recoil.

Specifications

• Barrel: 18" Stainless Steel, Medium Contour
• Gas System: Midlength
• Cartridge: 22 ARC
• Twist Rate: 1:7
• Gas Block Journal: 0.75
• Muzzle Thread: 1/2x28
• Platform: AR-15
• BCG / Charging Handle: Not Included
• Handguard: M-LOK, American-Made (style may vary)
• Origin: Made in the USA
• Warranty: Limited Lifetime
• Guarantee: Sub-MOA with quality ammo