Use a long black rod. If it is a connector barrel like the dunkis has on his TDS, you can extend it via an orange rod, but I would not recommend this.
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The longest you can make a traditional firing pin is a grey/black/clear rod long. Depending on the type of barrel, it is possible to put a connector between two of them but usually this will cause more friction. Your best bet is to make a rail based firing pin. Check out solekillers Sgt. Licorice on youtube or the logic bow here. I can't think of any other examples at the moment.