They usually go up 10 lb after some use. Sometimes they'll get noticeably zippier just straightening out the curves and flattening bumps in all the ports, widening exhaust to the max. Can't remember where it was but @Ketchup shared some excellent thoughts on improving flow.
Took a concealed carry certification at a gun shop with a range in N.C. in the late 90s. Between the classroom and range, they had us drawing and dry firing in their showroom full of customers.
arbsession.com usually has them at a good price.
edit: nevermind, I read tsumura not sugihara. Only sugihara solid bars arbsession has are laminated, not milled.
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