Mec is the best i've ever used and if you buy a new on it has the set up instructions with it. the 600 jr will last i've had mine since the 70s and the only thing i had to replace was the wad fingers less than a buck...
would like to go down and take care of their beaver and snake problems for them just a place to live and some of Miss Kay's cookin maybe swap some stories with SI
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most generally just the sight and the sound of the hammer coming back is enough but Remember "He who hesitates is lost" if you have to pull it be prepared to use it. (Hope you never need too)