SMALL BASE + EXTERNAL BRAKE + STD BARREL END CAP + STD THREAD ADAPTOR. BBG - NF#2 - O2SUGESTED CALIBER.204 > .220 (-1)ADDED LENGTH (mm):172OVERALL LENGTH (mm):190DIAMETER (mm):50WEIGHT (g):402COMPONENTS SelectTHREADM12 X 1 M13 X 1 M14 X 1 M16 X 1 M18 X 1 & IMPERIAL