[FS1]

Is it possible and if so what parts are needed to convert USP 10 round mags to 12 round.

 

[TooSixy]

No, unfortunately, it is not possible. IIRC, a member has used opoxy (or JB Weld) to seal the holes on the side of the mag housing and bend the lips on the bottom of the housing to accept a 12-rd mag floor plate but it is much easier trading the 10 for 12, or sell and buy one.

 

[FS1]

No, unfortunately, it is not possible. IIRC, a member has used opoxy (or JB Weld) to seal the holes on the side of the mag housing and bend the lips on the bottom of the housing to accept a 12-rd mag floor plate but it is much easier trading the 10 for 12, or sell and buy one.

I had a feeling that would be the case. Thank you sir.