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I have a 40s colt 1911a1 w/ 5 inch barrel. I want to purchase a new recoil spring. Was thinking about a Wolfe brand or something else don't know what to get. Also I understand springs due to being a mechanic, an engines valve spring needs a measured weight at a measured length so do you really have to trim 1911 springs as people suggest? Gun is 1911 colt slide on Essex frame