Solid riser/extension - Yankee Hill Machine Six Inch Rail Extension 0.5 Inch Riser YHM-9473

Not the best finish, but it works as expected. The recoil lugs are the cross screws and not a dedicated machined lug, so I would limit this to 308 class cartridges and under or you might see some damage to the weapon pic rail.

Useful for the S&W FCP which has a very far forward rail. This will bring a regular eye relief scope close enough to use.