I know this is not considered a sniper rifle, but I am hoping to get some info anyways. Bushmaster goes on and on about how you can change barrels and calibres in seconds but doesn't sell any of those parts to do that, at least not on the website. Does anyone know what is going on? Is this just an empty promise? I know they offer the ACR in 6.8 and 5.56, but no conversion kits are available that i know of. Does anyone know of a company, besides Argonauts Reincorporated, that is making ACR aftermarket gun parts?