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The Hopup Chamber M4i unit is designed to accept 21
but still having options for necessary attachments whether they're mounted to the front
Increased gear thickness provides higher bearing surface and improves structural durability
and such as wood grain feeling of each part parts shape and grip
enhance traction and secure grip
EMG / Salient Arms International BLU w/ Tier One Competition Slide Kit GBBP (Black & Gold / Blackout) Iron Sights The Hopup Chamber M4i unitMay come with orange tip. Features Lightweight, rugged injection molded polymer frame, with interchangeable backstraps and "stippled" texture for positive grip surface, designed off of the original SAI specifications for optimized ergonomics Frame integrated 20mm accessory rail is ideal for mounting weapon lights and other accessories Fiber optic front sight and SAI rear sight, designed specifically for single handed manipulation (compatible with all
