P250, P320, P320 X-5, M17, & M18 Pistols
I have both the P320 in 9mm carry (medium grips) and in .45 ACP compact (small grip). The .45 is a Gen.1 whereas the 9mm is the Gen.2 grip and slide lock back.
Talked to SIG customer support today and they would sell me the new Gen.2 slide lock but they stated it won't work on the .45 ACP as...