I5361 will not be a welded gun, but it could possibly have a two piece coned barrel. Most likely it will have a one piece stainless barrel, which would be best. (Two piece barrels weren't known for longevity). Most likely also is that the lower edge of the ejection port will be straight; and not dip downward at the rear. If so, it will be a strong slide, and would likely be capable of plenty of shooting life. If the ejection port does dip downward at the rear, then it's likely that the gun was returned to the factory and had it's slide and barrel replaced at some time; in which case it's still going to be a solid shooter. (Such returned guns were well taken care of by the former head gunsmith). Check to see if the mags say "Detonics 45 ACP" on them instead of "Detonics 45 Auto". The ACP mags are better.
Hope this helps, ...Deeton