9mm pistol gunsmithing

[HawkCreek]

If it's an aftermarket magazine I'd say it's suspect. Older Sigs are usually quite well made, accurate and reliable (at least that's been my experience). But Sig's in general do like to be run wet. When I carried a P220 I greased the slide as well as kept the rails oiled, the thing ran like a well oiled German machine...

[Bofire]

  everyone has a story, I bought two .40 sigs, used,  Neither one ever worked well nor were they accurate. I sold em, the guy I sold them to, sold them.
good luck!
Carl