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SAM7 receivers are milled from a hot-die hammer forged receiver blank by the Arsenal Co. of Bulgaria. Other milled-receiver AKs are machined from bar stock but Arsenals hot-die hammer forging produces stronger and finer-grained steel. Internal voids and cooling deformations are eliminated by the 5-ton hammer forging process.
Each forged receiver blank requires over 5.5 hours of milling before assembly. This forging and milling process is complex and time-intensive but Arsenals meticulous attention to detail delivers a receiver of unequalled strength precision and durability.