Tip:Do not use a stainless steel frame or slide for building up a custom gun.Stainless steel
has a tendency to gall up and bind the slide and frame.
Tip:Sti 38 super Mag work better when the rounds are a lenght of 1.240 to 1.245
Tip:Stretching mag spring after you clean your mag it will renews it tension
Tip:STI Mag Dimensions for Feed Lips
38 Super, 9 X 23, 9mm: 0.355 - 0.360
40 S&W 0.385 - 0.390
45ACP 0.435 - 0.440
Overall width side to side all calibers 0.935 - 0.940
Overall depth front to back all calibers 1.300 minimum
These should be the same for SV Mag bodies