Hi everyone I have a XD9 4" barrel pistol I bought in California. I now live Washington. I would like to know if I can use something other than a 10 round magazine (would like more capacity magazine) in this gun? Also this is probably a really dumb question but is my gun a 10 round +1in chamber? If it is how do I get the 11th round in the pistol? Any real help would be appreciated.