Don't know about that particular part but a lot of these types of parts are bought from other manufacturers and placed on proprietary brand guns. Even the big names like S&W usually do not physically make every spring, pin, etc. that goes into a gun like a 1911 when it's more cost effective to buy them from a contractor that produces them by the millions. I have an E series and the slide release was stiff when I got it. I've noticed the same with the Kimbers I've owned. The parts are produced by the tens of thousands and contrary to popular belief they are not necessarily "drop in" fit as minute differences in the frames (milling/polishing) can make a difference. "Stacking of tolerances" is the phrase used to describe the malfunction of a lot of guns where aftermarket parts are used to replace stock parts on many amateur gunsmith projects. Unfortunately the fit and finish of a lot of new guns these days never sees much human hands-on work. To keep costs down CMC production and MIM parts have been a boon where the need for hand fitting and adjustment are greatly reduced. Unfortunately it doesn't always produce perfection in execution. I have had to fit the slide stops on several 1911s to get them to function as they should.
As has been mentioned, if it's not egregious many times a 'break in' period of a few boxes of ammo will self cure the problem. Polishing/grinding on such parts needs to be done carefully bearing in mind you can always take off a bit more but you can't put it back on . . . .
) I have to ask. Is it a new gun from the factory, or did you buy it from someone else?
Anyway, if you don't have a lot of experience with 1911's, it could be helpfule.
