PWS MK114 Mod 1-M Upper | .223 Wylde | 14.5″

The Primary Weapons Systems MK114 Mod 1-M is a complete AR-15 upper built around a 14.5-inch anodized 416R steel barrel and chambered in .223 Wylde. The upper features a free-float M-LOK handguard, a mid-length barrel contour, and PWS’s long-stroke piston design carried over in the MK1 Mod 1-M line. This configuration balances maneuverability with accuracy for use across a variety of civil and professional shooting applications.

Typical applications include precision-oriented range work and law enforcement patrol or duty use where a durable, piston-driven upper is preferred. The MK114 Mod 1-M is intended for users seeking a rugged, mil-spec-leaning upper for AR-15 platforms.

Product Specifications

• The UPC for this product is 811154033482.
• The caliber/cartridge is listed as .223 Wylde.
• The barrel material is specified as 416R Steel.
• The barrel length is listed as 14.5″.
• The barrel finish is Anodized.
• The rate of twist is 1:8″.
• The overall color/finish is listed as Black.
• The handguard style/description is given as M-LOK.
• The upper is specified to fit AR-15 platforms.
• The model designation is MK114.
• The make is Primary Weapons System.
• The make/model combined field is Primary Weapons System|MK114 Mod 1-M.
• The product type is listed as Upper.
• The barrel contour is listed as Mid-Length.
• The listed weight value is 5.4 (unit not specified in source data).

The MK114 Mod 1-M upper assembles proven PWS design elements into a practical, service-oriented package: a forged upper, a piston-driven operating system, and a free-float M-LOK handguard for accessories. It is built to provide consistent performance for range-focused shooters and professionals who prefer a piston system and mid-length barrel geometry.