SMALL BASE + STD FRONT CAP + STD BARREL END CAP + STD INTERNAL BRAKE. BBG - NF#2 - O6SUGESTED CALIBERSelectADDED LENGTH (mm):153OVERALL LENGTH (mm):171DIAMETER (mm):50WEIGHT (g):408COMPONENTS SelectSUGESTED CALIBER.204 > .220 (-1) .243 > .270 (-2)