Quick response here -- I do not use nylon much, mostly brass and steel. The bad news is that I think you really do need two additional sets of steel punches to work on ARs: the steel punches with a small nipple on the end for driving roll pins and the set that Brownells sells for starting roll pins. I made do without but life is easier, and damage avoided, when you use the right tools. I finally gave up and bought them (in the order above) and would recommend you consider doing the same if you plan to drive roll pins with any regularity.