I'm having a hard time deciding what my next choice will be. I have always wanted an AR 15 as well as a tactical shotgun, but I'm not sure which one to get next. Currently I own a Glock 23 and a Ruger Mark II target pistol. I have never really been into long guns, and I'm not really sure which one I should get next. Any input as to which one and/or why you would suggest said choice?