Ergo Grip Spike Block f/AR-10. These Receiver Vise Blocks & Reaction Rods manufactured by the experts at ERGO are bolted or clamped securely to a bench or other work surface and feature a 1-piece glass filled polymer design. Specifications for Ergo Grip Spike Blocks for AR10: Manufacturer: ERGO Gun Model: AR-10 Gun Type: Rifle Color: Black Quantity: 1 Features of Ergo Grip AR10 One-Piece Spikes Block: 1-piece glass filled polymer design Fits rifles that use SR-25 pattern magazines 7oz 6-1/8" tall x 2" long (at the base) x 4-1/4" wide (at the base) 1/4" mounting holes Package Contents: Ergo Grip AR10 Spikes Block What firearm models does the manufacturer say Ergo Grip Spike Blocks for AR10 is compatible with? The manufacturer suggests that Ergo Grip Spike Blocks for AR10 is compatible with AR-10Ergo Grip 4989: Spikes Block for AR10