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I believe it is to compensate for small machining irregularities that might show up in either the sight or frame. A last ditch provision in case you have a loose fit to add a little tension on the dovetail. They show up on after market and factory installed Novak's...3rd gen Smith's come to mind.
@Velzey would be able to confirm this.
thats ultimately what I intend to do, I just wanted to make certain that set screw wasn't the only lock by design. What you said above is what I assumed about all dovetail sights... makes sense to me.if this is a brand new OEM set up I would send it back to Wesson and tell them to fix it. It's a quality control issue IMO.
I was thinking the same thing, thats partly why I was wondering what it entails to replace the slide on a 1911.If it was me, I'd send the whole thing in just in case they do need to replace the slide. If they already had a blooper with the slide to sight fit, who's to say there won't be another fit issue with a replacement slide and frame ? That way it's on them to give you back a properly test fired and functioning weapon. You're not out anything since it's on warranty and maybe you'll get a freebie {mag} for the trouble.
agree but to clarify that is what they fixed. There is no gap now. The rear sight is a new one.I have never seen one with a gap like yours, so that is not good! Especially on a Dan Wesson!
Normally, these sights are SO tight, that you need a sight pusher to adjust them, so you would think the set screw wouldn't be needed, but after moving it around a few times, they can ( very rarely) move, so the set screw is installed.
I'm no pro but the ones I have installed I had to file the rear sight to get them to fit. It's ok to file the sight base but NEVER file the slide. The set screw is a belt and suspenders thing. They should be a tight fit.