PWS MK114 MOD 2-M .223 Wylde Thread Protector - Complete Upper - 14.5"

For builders who want PWS's Long Stroke Piston System and sub-MOA precision in a compact 14.5" .223 Wylde upper — without a muzzle device attached — the Primary Weapons Systems MK114 MOD 2-M ships with a thread protector installed on the 1/2"-28 threaded muzzle, ready to accept the compensator, brake, or suppressor mount of your choice.

The Primary Weapons Systems MK114 MOD 2-M is a complete upper receiver assembly designed for AR-15 builders who want PWS piston-driven reliability and sub-MOA precision in a compact 14.5" .223 Wylde platform, with the muzzle thread left unoccupied for user-selected muzzle device installation.

The 14.5" barrel is the most common length for military M4-pattern rifles, delivering a compact, maneuverable package while still maintaining adequate velocity and gas system function with standard carbine-length gas. The .223 Wylde chamber accepts both .223 Remington and 5.56mm NATO with excellent accuracy — wider than a true 5.56 chamber for better bullet release, tighter than a pure 5.56 chamber for improved consistency. The PWS Long Stroke Piston System keeps the upper receiver group clean and cool even during sustained suppressed fire, and the 3-setting Adjustable Gas System lets you tune gas flow for standard use, suppressor use, or different ammunition weights without tools. PWS backs this Boise-made 14.5" barrel (1:8 twist) with their sub-MOA accuracy guarantee. The ambidextrous MOD 2-M upper — machined from 7075-T651 forged aluminum without a forward assist — pairs with the PicLok handguard for Picatinny and M-LOK accessory mounting. At 4.3 lbs, this is a very lightweight upper for its capability level. The 1/2"-28 threaded muzzle ships with a thread protector installed — no muzzle device is included with this specific upper configuration.

Caliber: .223 Wylde (compatible with .223 Remington and 5.56mm NATO). Barrel: 14.5", 1:8 twist, sub-MOA guarantee. Muzzle: 1/2"-28 threaded, thread protector installed (no muzzle device included). Gas system: PWS Long Stroke Piston, 3-setting adjustable. Receiver: forged 7075-T651 aluminum, ambidextrous MOD 2-M design. Handguard: PicLok. Charging handle: Radian Raptor ambidextrous. Weight: 4.3 lbs. Compatible with mil-spec AR-15 lower receivers.

7075-T651 forged aluminum ambidextrous receiver ensures rigidity and mil-spec compatibility. The 3-setting adjustable gas system provides straightforward suppressor optimization. Sub-MOA guarantee backed by PWS's Boise, Idaho precision barrel facility.

An excellent choice for compact AR-15 builds, duty carbine configurations, and suppressed builds where the user wants to select their own muzzle device — including permanent-pinned compensators for legal 16" OAL compliance on non-NFA builds.

Backed by the PWS VOW — Primary Weapons Systems' warranty guaranteeing repair or replacement for any manufacturing defects. Precision manufactured in Boise, Idaho, USA.