Primary Weapons Systems MK118 MOD 2-M Complete AR-15 Upper Receiver - 6mm ARC - 18"

The Primary Weapons Systems MK118 MOD 2-M Complete AR-15 Upper Receiver in 6mm ARC pairs PWS's long-stroke piston system with an ambidextrous receiver and PicLok handguard on a 18" barrel.

Features:

• 18" barrel, 1:7.5 twist, sub-MOA accuracy guarantee
• PWS long-stroke piston operating system, 3-setting adjustable gas block
• Ambidextrous forged 7075-T651 aluminum upper receiver, no forward assist
• PicLok handguard, combined Picatinny and M-LOK mounting
• PWS FRC 2-Port Compensator, Rearden Atlas suppressor compatible
• Radian Raptor ambidextrous charging handle
• Weighs approximately 5 lbs

The MOD 2-M's ambidextrous receiver drops the forward assist for a cleaner profile while keeping mil-spec-compatible fitment, and the 3-setting adjustable gas block gives you straightforward suppressor tuning without extra tools or hardware. PWS backs this Boise-made barrel with a sub-MOA accuracy guarantee, and the PicLok handguard blends Picatinny rail sections with a slim M-LOK profile for a comfortable support-hand grip.

This upper is well suited to precision rifle builders, hunters, and tactical shooters who want extended 6mm ARC capability on an existing AR-15 lower, particularly for suppressed precision builds where piston-driven reliability is a priority.

Primary Weapons Systems is a U.S.-based manufacturer known for its long-stroke piston AR-15 and AR-10 platforms, backed by the PWS VOW warranty covering repair or replacement for manufacturing defects, and precision manufactured in Boise, Idaho.