BURRIS KNOB SYNERGYA(R) PRO (MULTI-TURN) KNOB Burris Knob SynergyA(R) is a revolutionary modular turret system designed to give shooters the flexibility they've always wanted. Now featured on the next-generation Fullfield riflescopes, Knob Synergy lets you seamlessly swap between different elevation and windage knob styles-so your scope adapts to your mission, not the other way around. From hunting the backcountry to dialing for steel at distance, Knob Synergy puts control in your hands. Upgrade your knobs, not your scope. The Knob Synergy Pro Multi Turn is designed for the 2025 or newer Fullfield scopes. Mfg: Burris