© MidwayUSAJP Enterprises VMOS Variable Mass AR-15 Bolt Carrier 5.56x45mm NATO QPQ Black
- Brand
- JP Enterprises
- Color
- QPQ Black
- Caliber
- 5.56x45mm
- Category
- Gun Parts
- Platform
- AR-15
- Gun Part Type
- Bolt/BCG
- UPC
- 812872024448
Overview
The JP Enterprises VMOS (Variable Mass Operating System) bolt carrier is designed for 5.56x45mm NATO AR-15 platforms, specifically to provide mass regulation in rifles with difficult configurations, such as suppressed systems or exotic calibers. The carrier features a QPQ black finish for enhanced lubricity and wear resistance. It includes an enhanced gas ring, instruction sheet, and a roller-burnished bore for frictionless operation. The design incorporates a longer cocking pad and additional forward assist serrations for one full inch of travel. The VMOS system allows for custom tunability by exchanging forward masses, though the rear steel mass is fixed. It is intended for use with a Silent Captured Spring; standard buffer/spring components must be installed "loose" or replaced. Note that this carrier will not cycle with a standard buffer retainer plunger installed.
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