My friend and I were shooting the other day and the topic came up of after how many rounds should you change the barrel of your hand gun(specifically my 9mm XDm and his 9mm XD service). He seemed to think somewhere around 5,000 but i think that is too low. I told him at the rate that i've been shooting since i got interested in firearm and personal protection that i would have to change my barrel every year and that doesn't seem right, but idon't know i am new. What do you think???