Posting pictures, process of elimination tells me the barrel is hanging up upon reassembly.

Frame was not disassembled or altered other than new grip panels installed.

Barrel was not refinished, just the slide.

This message has been edited. Last edited by: OttoSig,

I can't give you a number, but it's pretty thick. I stripped the slide on the P228 that I got because the finish was really bad, and rust blued it. I also ordered new sights and when I went to install them, they were loose in the dovetails. I had to do some peening of the sights and add loctite to get them to stay in place, and while it seems to have worked I'm not 100% confident in that resolution. So long story short, the finish is thick enough to have some dimensional impact on parts fitment.

Curious, how much did it cost to have Sig refinish your slide in Nitron?

I think I had a Sig that did this. The slide was not refinished. I could never figure out why.

What I did was put grease on the bottom of the feed ramp and the top, leading edge of the locking block and gave it a good shove. That got the slide on.

The pistol functioned fine after I got the slide back on.

From my research, the Nitron is a PVD finish. We do that a lot in the putter business and it is something I am fairly familiar with. It can be done as thin as a single micron, so in 99.9% of applications, it is not a thick finish.
Your situation may be due to the new finish and its satin sheen being a little less slippery than the old polished bluing that may have been stock.
I'm no expert on Sig pistols and will not claim to know the fix, but my bet is that it is not the thickness of the Nitron finish.
One Mann's Opinion,
LaMont in AZ

quote:

Originally posted by Broadside:
I think I had a Sig that did this. The slide was not refinished. I could never figure out why.

What I did was put grease on the bottom of the feed ramp and the top, leading edge of the locking block and gave it a good shove. That got the slide on.

The pistol functioned fine after I got the slide back on.

Two soft swipes on the feed ramp with an emoty board and a touch of grease did it.

Thanks.

Otto

Nitron is ferritic nitrocarburizing, which hardens and blackens the stainless steel to a case depth. It is not a coating.

Melonite is the same/similar.

SIG used to send their slides to IonBond for refinishing. It was a PVD process and the "DLC" coating was under 10 microns (<0.0004") thick if I recall... so very thin. I don't know if they still send product there but 10 years ago they did.

I think it was this one...
https://www.ionbond.com/coatin...olio/tribobondtm-42/