Ruger Standard, MK II, III, IV Pistol Charging Handle

thingiverse

I found another design on Thingiverse that uses a 1/4-20 thread, but I thought 1/4" was too thin for this application, so I redesigned the bolt puller from scratch. The clamp is now more robust and features a sturdy design, while the knob screws into it with a 3/8-16 thread. Two different knobs are available: one cone-shaped and another that resembles the Volquartsen bolt. To create the clamp model, I designed a replica of the bolt first, then gave the threads on the clamp a .010" clearance to ensure smooth operation. This design is still quite tight on the bolt, but it can be installed without pliers. My +1 Magazine Extension for the Mark IV can also be seen in the pictures; this modification boosts the capacity to 11 rounds. The designs were created using Fusion 360, and I've included the F360 files so you can experiment with them yourself if you like.