This is a Bellm 1X and 2X hinge pin set. This is the first place to start if you want to improve the accuracy of your Contender shooting platform. Always install with a heavy viscosity lube. Here is a simple test, with no barrel in place see if you can move your hinge pin with your finger alone. I sell/handle a lot of frames and see first hand how loose factory hinge pins are. Start with the 1X and if still loose then go to the 2X.
Check out our YouTube video below discussing Hinge Pin Protocol: