I have a single action Rod (W/Sail). I have used the same Action Rod on 204 Ruger, 5.56/223 Rem, 22 ARC, 6.5 Grendel, as well as 300 HAM'R. As far as I know the Locking Lugs are the same on almost all AR15's that are chambered for Centerfire Rifle ammunition.
An Exception: Someone makes a Delayed Roller Blowback AR15 upper that does not have conventional locking lugs.
Also 22 Rf and Pistol Caliber Carbine uppers do not have locking lugs as far as I know.
Bob R
