I have heard of the 45 Super conversion for the 4506 but am only interested in the occasional use of heavy bullet +P loads from Buffalo Bore , Grizzly, and such ! I don't think I'll need more than a 20 lb recoil spring for this and maybe the 18 lb spring will work fine ! I just don't want to batter my 4506 no dash since I want it to last awhile !
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