Took these off of a 12.5” build. Lantac Dragon muzzle device 5.56/.223 with Lantac BMD (Blast Mitigation Device). Comes with A2 connection device. Less than 500 rounds through this set up. I do not have timing shims available so you will need your own. Would prefer to sell this as a package deal. $300. Located in Prosper. Face to face transaction. No shipping. Check my other listings.