Have a new and unfired Ruger PC carbine to which I'm adding an additional third party extended mag release and charging handle on left side.(Comes from factory with each of these on right side which will remain.) I want to start out by doing things correctly so feel a quality 1/4" Drive torque wrench (or screwdriver?) would be a good purchase. Ruger specs require for screws on the carbine to use bits of 5/32nd" and 5/64th" with 15 INCH pounds and 65 inch pounds of torque required. A local gunsmith said don't get a "digital" one because mechanical ones are more accurate and durable long term. Anyone using a torque wrench on your Ruger weapons? Any advice on name brands, quality and online sources would be helpful. Thanks in advance to all who reply! Note to all military VETs: MAY is National Military Appreciation Month...yes really. Google it. Perfect time to remind vendors(many unaware of NMAM) and politely ask for a VET discount. All they can say is no. Stay safe all!