Simplest and cheapest counter. Number of rounds loaded X the number of time you must pull/push/cycle the handle to make a complete round, up and down as 1 or up and down as 2, your choice.
NRA Life Member, NRA Range Safety Officer, NRA Certified Pistol Instructor, IDPA Safety Officer, USPSA NROI Range Officer,
ICORE Range Officer, ICORE Match Director
As you are, I once was, As I am, You will be.