A new gun range 5 minutes from my house is going to start USPSA in September, before I had to drive 2 hours one way to shoot so I haven't shot a match lately so it's time to dive in full boar again. I thought I read somewhere 140mm mags are legal in CO, is this true? Also I just purchased a Sig P320 X-Five Legion and wanted to know if the small factory mag well was legal or do I need to remove it? TIA!!!