MXPB18/90 (to suit 0.9 gun)
MXPB18/10 (to suit 1.0 gun)
MXPB18/11 (to suit 1.1 gun)
MXPB18/12 (to suit 1.2 gun)
MXPB18/13 (to suit 1.3 gun)
MXPB18/14 (to suit 1.4 gun)
MXPB18/15 (to suit 1.5 gun)
MXPB18/16 (to suit 1.6 gun)
