It's a hard one to explain. you'll see where you have to modify it because you can feel where the slide grinds against the rails that hold it on. You'll feel resistance in specific areas and a nice needle file can take care of that however as i've mentioned SD slides in general are beautifully finished but fit like crap. I haven't touched these slides in months, I just have them fitted enough where it can cycle the slide by hand but it's still extremely tight. It's a unique gun, and with only one manufacturer making slides I still think it was worth the time and efforts required for a proper fit
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