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The proprietary lightweight nanocomposite construction of the SFI-15 lower receiver provides a superior strength to weight ratio. Our nano-composite material also processes the kinetic energy created by the firing process in a much more efficient manner, producing less felt recoil compared to the traditional aluminum alternative. Marked Multi Caliber - Ships without buttstock.
The proprietary lightweight nanocomposite construction of the SFI-15 lower receiver provides a superior strength to weight ratio. Our nanocomposite material also processes the kinetic energy created by the firing process in a much more efficient manner, producing less “felt recoil” compared to the traditional aluminum alternative. Combined with our patent pending SureSafe™ Fire Control System and you have the lightest and safest AR-15 / M4 / Variant rifle platform available anywhere in the world.
Our lower receiver ships complete with the following parts:
• E-SAFE™ FCS - fire control group
• SFI commercial receiver extension, spring and buffer
• A2 pistol grip
