The Brushline Pro 4-16x50mm SFP Rifle Scope from Crimson Trace is a great scope for the shooter that wants to be able to choose between 30mm or 1" chassis, but maybe use both scopes on different guns depending on needs. The Crimson Trace Brushline Pro 4-16x50mm SFP Rifle Scope offers the same BDC Pro reticle in both chassis designs, along with every other feature, so if you have multiple guns and want to run the same reticle, but one is more suited for the 30mm or 1", you can make that change without going to a whole new scope. The only difference is slightly less eye relief on the 30mm version, at 3.7" and 4" on the 1" model. Available in 1" or Mfg: Crimson Trace Corporation