Rousch Regular Profile Flush Mount Picatinny Rail Height Block +Stainless Steel Roll Pin .750" Model 15/4 .223 5.56 7.62X39 300 AAC Blackout .22 etc..
Rousch Regular Profile Flush Mount Picatinny Rail Height Block .750Stainless Steel Roll Pin included BONUS!It sits flush to the receivers top rail to allow for co-witness of  accessories / sights .Block attaches securely via the two set screws on the bottomNo modification to your barrel is required.Rousch Regular Profile Flush Mount Picatinny Rail Height Block+Stainless Steel Roll Pin Specifications:•T6 6061 Aircraft Aluminum Body•Bead Blast Hard Anodized Finish•Precise Machining•Milspec 1913 Picatinny Rails Top And Bottom•"Flush mount" Profile  Block for .750 Barrel•45 Degree Slant On Front Of block On Top Rail•Attaches with two set screws on the bottom of the block•Stainless Steel Roll Pin Included BONUS!• Length = 1.915• Top Rail Length = 1.394"Lower Rail Length = 1.915"Height /Distance from top to Bottom= 2.00"