15 Best Gunsmithing Torque Wrench: Update 07-2022 TEKTON. Prime. Product 2: DURABLE: Bits are made of S2 tool steel and hardened to 56-58 Rockwell "C". Product 2: EASE OF USE: Apply, repeatable, accurate torque settings to scope rings, guard screws, windage screws and base screws, which aids in accuracy and decreases the opportunity for problems in the field more. 6.