Mk109 Mod 1-M 300blk Upper Receiver W/9.75" Bbl
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specifications

Manufacturer:

Primary Weapons

Platform:

AR-15

Caliber:

300AAC

    Mk109 Mod 1-M 300blk Upper Receiver W/9.75" Bbl

    Caliber Manufacturer Color Weight Merchant Price Merchant URL
    300AAC Primary Weapons None None None $1,129.95 Brownells Add

    Prices last checked September 2026. Prices and availability change often, so confirm on the retailer's site.

    PRIMARY WEAPONS AR-15 MK1 MOD 1-M UPPER RECEIVER ASSEMBLY 300 BLACKOUT M-LOK The Primary Weapons Systems MK1 MOD 1-M line of upper receivers feature the PWS long stroke piston system. Internally, this line offers the tried and true system that PWS owners have grown to know and love. Featuring a free-float MLOK handguard, forward assist controls, and a more true to mil-spec design, the MK1 MOD 1-M line is a go-to for not only civilians, but also Law Enforcement. With the fully forged upper, the MK1 MOD 1-M is a no-nonsense tool for when you need a high value option that is relentless and unstoppable. PWS bring back the original MK109 in 300BLK. The 9.75" Mfg: Primary Weapons

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