There are 3 different barrel types, A, B, and C. You need to know the barrel(s) you have (they may not necessarily be the same!) and then order the corresponding piston.

A barrel + B piston
B barrel + # piston (no mark)
C barrel + D piston

Don't ask why the middle piston isn't a "C"... no-one knows!
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Andy.
NSR-WORLD.COM

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