I have fit my Barsto 9mm barrel on my X-5; went from 40 to 9mm. The barrel sits in the slide nice and tight with no extra force to seat in in the slide>

The issue I am having is getting the gun out of battery; it requires a bit more force than my other Sigs. My question is: should I champfer the leading, outer edge (looking at the slide from the top, muzzle away from you) similar to a slight ramp? A mild break on the leading edge, nothing overly aggressive.It appears that this would ease ease the leading edge out of lock up. The other option to preserve the tight lock up is to shoot it until it smoothes out. I don't know which will yield first: the barrel or the slide> My money is on the slide yielding first. I don't want to do anything to jeopardise the tight lock up.

Thoughts?

If the slide goes into battery and the gun functions normally, I wouldn't touch anything. The barrel of the first 357 SIG P229 I owned was similarly tight. I later discovered that the gun had left the factory chambered for 40 S&W and evidently the dealer swapped barrels when I wanted one in 357.

After I fired the gun just a little, the tightness disappeared. Based on my observations, it's the barrel that wears to the slide in SIG pistols, not the opposite.

If the problem does not disappear or, more important, you experience consistent extraction or ejection failures, then I'd worry about it and contact Bar-Sto.

Thanks for the reply> I think I will take the conservative route on this. I have run maybe 200 rounds through so a good excuse to shoot it some more.I think it is going to work out for the better leaving it alone and let it lap itself in.

I agree with sigfreund. I like to think of it as "lapping by fire". I always use plenty of grease and look for rubs on the frame and insert.
A trick I like to do when I get the barrel fit up pretty close, is to use a Sharpie and find the "rub". In my experience it will be on the side(s) of the hood, back of the hood and the surface below the feed ramp. Usually a few passes with an India stone and some honing oil and it's working great.

I have now shot the gun with the new barrel approximately 750 rounds. The lock up is still tight but tight in a good way. I never had any issues with the gun and failures of any kind. I was concerned when doing a press check that the slide was tight enough to cause a bit of extra force to get it out of battery when compared to my other X5 and some other Sigs.

All said and done I am glad I took the conservative route and am happy with the quality of the barrel and fit. I have not suffered any decline in accuracy with the Barsto barrel versus the original X5 barrel.

The site has again proven to be a valuable resource. Thanks for the help.