Add an additional barrel to your R8. Each R8 barrel is interchangable with the R8 receiver. Each barrel will ship with a mag insert for the cartrdige. We currently have the following barrels in stock: 

.300 Win - Requires magnum bolt head (sold seperately if you dont already have one)

6.5 PRC - Requires magnum bolt head (sold seperately if you dont already have one)

.30-06 - Requires standard bolt head (sold seperately if you dont already have one)

.308 Win - Requires standard bolt head (sold seperately if you dont already have one)

6.5 Creedmoor - Requires standard bolt head (sold seperately if you dont already have one)