MXPB20/90 (to suit 0.9 gun)
MXPB20/10 (to suit 1.0 gun)
MXPB20/11 (to suit 1.1 gun)
MXPB20/12 (to suit 1.2 gun)
MXPB20/13 (to suit 1.3 gun)
MXPB20/14 (to suit 1.4 gun)
MXPB20/15 (to suit 1.5 gun)
MXPB20/16 (to suit 1.6 gun)
