If your asking can you get a conversion barrel to convert a 17 to be able to shoot 40. then no you cant.I know I can take my 40 caliber Glock and put a drop in 9 mm barrel, Can I do it the other way around?
Can I shoot 40 caliber out of my Glock 17 with a drop in a 9 mm barrel?
If your asking can you get a conversion barrel to convert a 17 to be able to shoot 40. then no you cant.