Some of the guys at my IDPA club are doing a once month 3 gun. When I expressed a desire to try it but said the only shotgun I had was a 30 year old Rem 1100 28in barrel, they said no problem just slap a short barrel and a long mag tube and your ready to go. Sounds easy but after searching the web and emailing Rem. I don't think it is as easy as it sounds. Is it worth a try or should I buy a new gun? What is the best gun for the money? (Read cheapest.)