Here is the Moonshiner interchangeable caliber rifle from Bluegrass Armory. Justin Raney tells us the rifle is offered in .338 Lapua, .300 Winchester Magnum, and .308. In the video, he demonstrates how easy it is to switch from one caliber to another.
The rifle has a 36″ overall length with it’s 21″ barrel and weighs about 11 pounds. It has multiple picatinny rails, multiple quick disconnect points, and uses an ar-15 pistol grip which can be switched to any AR grip you like. The barrels are tapered with fluting and muzzle brake options.