I just acquired a Glock 21 from a retired Chicago suburb cop. I have been shooting bullseye year round indoors 1x/mo and outdoors when the weather is decent also 1x/mo at the ISRA range. The ISRA range also conducts "combat shoots" a couple of times a year that looked very interesting. What equipment do I need to start? Are any modifications to my gun needed right away? And, I currently reload my own .45 for bullseye shooting. I like using Hogdon Clays powder. I also understand I need to use a FMJ bullet (not hard cast) in the Glock. Can I get some recommendations for a Clays load for IDPA / combat shooting? Thanks Wanna kill these ads? We can help!