Picking up where the BKF line leaves off, the M4 Mod-0 line is geared towards the duty and professional grade user. If mil-spec is the standard, the M4 Mod-0 line exceeds the existing standards. With receivers manufactured from the highest quality 7075-T6 aluminum on the market, this product line is meticulously machined to tolerances exceeding those in mil-spec classifications, providing for a more solid fit and higher level of functionality than other competitors on the market. M4 Mod-0 parts include enhanced and polished triggers, buffer systems and Sprinco springs matched to the gas system, barrel length, and caliber. Beautifully coated nitride components are standard to the M4 Mod-0 line. Also available on M4 Mod-0 rifles is the “combat-ready” upgrade (see product for more details). As with all BKF products, the M4 Mod-0 line is proudly sourced, manufactured, and machined right here in the U.S.A. When your mission hangs in the balance, rest assured knowing that the possibility of equipment failure is a non-factor. Designed by discerning professionals, for discerning professionals, the BKF M4 Mod-0 line sets a new standard in duty-grade work components.