A local gun shop has a consignment glock in 45 gap I think it's a model 38 for 200 otd after taxes and background check and that gun proficiency test since this is my first hand gun. My question for those in the know is would it be possible to buy a replacement barrel and convert it to something more useful like 40 s&w or even if possible 9mm. I know I will need a new barrel but what else would I need to do and can it be dun and keep the gun cheaper than a brand new gun? I wouldn't necessarily have a problem with 45 gap but there doesn't seem to be much ammo out there. Anyone with info thanks for you advice in advance.