From Sven at Manticore:
"We anticipate the 14x1L mm (model MA-1214) and 1/2x28 tpi (model MA-1228) threaded Nigthbrakes will be available in six to eight weeks. The 24mm and the two newer threadings will look slightly different in the rear threaded "collar", but the front end will function and have the same performance on all three. All three models can safely shoot up to a .30 caliber projectile safely. Both the MA-1214 and MA-1228 have a standard STANAG 22mm diameter."
MRSP is $47.95.