-Buffer Tube Milling File (intended to shave down the best of an AR-ten Buffer tube so that the charging cope with can obvious on some upper/reduced mixtures) I’ve engraved BRN-4 416 lowers to imitate the HK 416 logos. With enough passes, a fiber laser can perform deep engraving likewise and https://ghostgunsofficial.com/product/ghost-gunner-3-s/