This brake came on a 7mm mag I traded for. Had barrel threaded so no need for it now. Great brake made 7 mag feel like a .243. 615-.628 ID for barrel .325 bullet ID. Asking $50 OBO
Came on a tikka t-3 lite in 7mm. Standard barrel profile not a heavy or varmint bbl. Brake has .615-.628 stamped on clamp end. I'd mic my bbl but it's being threaded at the moment.