Sig is going to cover inproper installation of a non factory item by an independent vendor? Not likely. The sight installed from the factory was secure.The manufacturer (Sig) has to cover their rump to warranty the product, hence a new slide. Sights are designed to be tight in the dovetail. It requires some lube on the sight as well as a good sight tool or in the case of older Springfield XD/XDMs about a 6 ton press. Always take it to someone that knows what they are doing. It may cost a bit more, but it only hurts once.
There are lots of "that guy" gunsmiths out there. They're the reason why I learned to work on my own guns.Well, it's hard to imagine someone would file the dovetail. The slide is much harder material than the sight, which is malleable.
But there is always that guy.
This. You just need a new front sight and take it to a reputable smith this time. Those marks on the dovetail are ugly but they won’t effect a front sight not staying put. Those marks make me think the guy installing your sights use one of those cheap $25 ebay sight pushers. Those don’t hold the sights straight and they will shift left or right while being “pushed” into place. They will gouge the slide dovetail. I’ve seen it before.Dovetail sights are slightly oversized and need to be fitted by sanding/stoning the bottom to ensure a tight fit.
At a guess, and this is just a guess, the smith removed too much material and the sight is now too small for the dovetail.
I would take it to another smith to have a new sight installed. The LGS where you purchased it may have someone to recommend.
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“He might have filed the beaver tail on the slide to fit”I think your gunsmith screwed you up big time
Rather file the sight ..
He might have filed the beaver tail on the slide to fit ..
Take your gun to another Lgs buy another set and let them try ..
Curious, if you put the original sight back on is it loose too? The problem might be with the Truglow sight.
So did you try the original sight to see if it works or is now problematic too?That's a good question actually, I haven't tried that yet. When I get home I will test that out and let you know the results. Worth an attempt