Machined entirely in house, ZRTS manufactures these forged 7075 lowers to exact tolerances. Each unit starts as a 7075 mil-spec forging. ZRTS machines the units to all Mil-Spec tolerances. Magwell corners are broached. These components are included with each lower. Black finish is a Mil-Spec Anodize. MUST SHIP TO AN FFL
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