Browning s Integrated Scope Mount System unitizes the ring and base into a single, ultra-rigid unit. Machined from 7000 series aluminum alloy, they eliminate alignment problems and the possibility of a loose connection between the base and ring. *Note- These fit the AB3 only. They do not fit original A-Bolts or A-Bolt II receivers.
Specifications:

Type	1-Piece Base
Tube Diameter	1"
Height	Standard
Size
Finish	Black Matte
Style
Material	Alloy
Style Description	Rifle
One or Two Piece	2
Adaptor Type
Mount Type
Lock Type
	Standard