Going to Gunbroker 11/03/2017. Per forum rules, please delete. I have a used, but like new (no visible sign of use), Advanced Armament Co (AAC) .7.62 / .308, 3 prong flash hider with the 51T ratchet for attaching the 51T AAC suppressor/silencer. It has standard USA right hand 5/8x24 threads. I had this mounted on my KT RFB but I never bought the suppressor/silencer. $79 price includes insured UPS shipping. Here are my photos taken yesterday - Here is a link showing more info - https://ads.midwayusa.com/product/284904/advanced-armament-co-aac-blackout-flash-hider-51-tooth-ratchet-suppressor-mount-762mm-ar-10-lr-308-5-8-24-thread-steel-matte?utm_medium=shopping&utm_source=connexity&utm_campaign=Gunsmithing+-+AR-15+Parts+(Not+Magazines)&utm_content=284904&cm_mmc=pf_ci_connexity-_-Gunsmithing+-+AR-15+Parts+(Not+Magazines)-_-Advanced+Armament+Co+(AAC)-_-284904 Thank you for looking at my listing.