I seen this on TV and you can change barrels like a AR15 and It a Ruger rifle I would like to own if I had a 500 yd plus range near me . Retail is only $1399 and add a $499 scope and your in business ..
http://www.ruger.com/products/precisionRifle/models.html
http://www.ruger.com/products/precisionRifle/models.html