Looking at a Lothar Walther SASS barrel in 16" , I need to confirm the twist, I think the Canadian SASS was 1 in 11.25. Not to fond of the thread, not going to suppress it, I cannot seem to find a brake to fit. Chambered for 7.62x51mm/.308. Threaded 11/16-24TPI for OPS suppressor. These are black ceramic coated. These barrels were made for a Canadian contract.