-Buffer Tube Milling File (intended to shave down the highest of the AR-10 Buffer tube so the charging take care of can distinct on some higher/decreased mixtures) I’ve engraved BRN-four 416 lowers to imitate the HK 416 logos. With plenty of passes, a fiber laser can do deep engraving also https://ghostgunsofficial.com/product-category/gg-purchase-product/