If ou're looking to add more weight to your buttstock, these LOP (length of pull) spacers are a great option. The MDT Buttstock Spacer Weights are interchangeable with MDT buttstock spacers and compatible with: XRS Chassis System SCS-Lite (Skeleton Carbine Stock Lite) CCS (Composite Carbine Stock) SPECS Weight: 0.8lbs each Each spacer weight adds 0.5"" LOP Sold as a single spacer COMPATIBILITY These spacer weights are compatible with the following MDT products: XRS Chassis System SCS-Lite (Skeleton Carbine Stock Lite) CCS (Composite Carbine Stock) WHAT YOU GET One single Buttstock Mfg: Mdt