Primary Weapons Systems MK114 Mod 1-M 14.50" Upper .223 Wylde 1:8 M-LOK Mid-Length with Charging Handle, Black - Precision Accuracy - M114UA01-2F-NC
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Primary Weapon Systems
Overview
The Primary Weapons Systems MK114 Mod 1-M is a complete upper receiver designed for AR-15 platforms, featuring a 14.5-inch barrel chambered in .223 Wylde, which allows for optimal performance with both .223 Remington and 5.56 NATO ammunition. Its mid-length gas system provides a smoother cycling operation and reduced recoil, while the 1:8 twist rate ensures improved stability for a wide range of bullet weights. This upper is particularly popular in builds that benefit from a mid-length gas system and the versatility of .223 Wylde caliber.
Specifications
Primary Weapons Systems MK114 Mod 1-M 14.50" Upper .223 Wylde 1:8 M-LOK Mid-Length with Charging Handle, Black - Precision Accuracy - M114UA01-2F-NC
Build history on GunPartPicker
Builders on GunPartPicker first added the Primary Weapons Systems MK114 Mod 1-M 14.50" Upper .223 Wylde 1:8 M-LOK Mid-Length with Charging Handle, Black - Precision Accuracy - M114UA01-2F-NC to a build in June 2026.
It was hard to find in September 2026, in stock on only 9 of the 26 days we checked, and today none of the 3 retailers we track has it in stock right now. Prices barely moved in September 2026, holding around $1,029.49, so there haven't been real sales lately. Listed prices start at $1,029.49 at Brownells for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Frequently Built With
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