How much can you take advantage of the P320's modularity and still remain in SSP? For example, the X5 has been deemed legal in SSP. (without the magwell and grip weight). Could I use that grip module with a standard P320 FS slide? There's nothing that would make it technically against SSP rules, but changing slides is not specifically allowed. The only mention of slides is to disallow an "aftermarket slide", which a standard P320 slide is not. Changing frames seems to be allowed on a Glock 17/22, but the X5 grip module is not "identical" to the standard P320 grip.