Sig makes very fine weapons.But if I were in the market for an interchangeable barrel rifle,I'd really consider the SigArms 202.The Blaser has the pull-back bolt,which is really slick,but when you take the barrel off,the scope comes off with it-meaning either you remount the scope on the other barrel or buy additional scopes for each barrel.With the 202,the scope stays mounted on the receiver and just needs some final sighting in.If you plan on getting differant calibers,the 202 would definitely be more cost-efficient.