Hello. I am a long time custom 1911 shooter and recently have been bitten by the IPSC bug. I am running my bullseye guns but am looking for something to run in the production class. If I get a glock and keep it fairly stock except for maybe a FO front sight and extended mag release will I be able to shoot production class in IPSC, IPDA, and USPSA? What caliber and length would you recommend for an all around gun? I have been reading a lot and it seems in IPSC many run with the 34. Would I be less competitive with a 21, 22, or 17?? Thanks in advance.