Wow, that's crazy the stock parts gave up on you so quickly. Just the other day, I did some chrony testing with the 392 and must have pumped it over at least 300 times in one session, all the way up to 10 pumps for a few shots and it's still shooting strong as ever, (knocks on wood).
Would definitely keep MAC 1 in mind if it so ever fail. How difficult was it to get out the old pump lever out and put the new one in? And did you have to purchase the adjustable pump arm linkage?
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