• BSA Monarch
• Mossberg 1500
• Mossberg 1700
• Remington 40X Short Action
• Remington 600
• Remington 660
• Remington 700 Muzzleloader
• Remington 700 Right Hand-Short Action
• Remington 721 Right Hand-Short Action
• Remington 725 Right Hand-Short Action
• Matte
• 8-40 Adaptable

The Mark 4 System employs a slot and spline design, and comes in 1-Piece and 2-Piece configurations. Mark 4 Bases accept Mark 4 Rings, Cross-Slot Rings, and QRW/PRW Rings.

For (8-40 Adaptable):

• BSA Monarch
• Mossberg 1500
• Mossberg 1700
• Remington 40X Short Action
• Remington 600
• Remington 660
• Remington 700 Muzzleloader
• Remington 700 Right Hand-Short Action
• Remington 721 Right Hand-Short Action
• Remington 725 Right Hand-Short Action