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The Origin mechanical mod by EHPro is nicely finished with a brushed-like brass finsih provided with extension tubes for various sized batteries. These tubes will allow such sizes as 18350, 18500 and 18650 to suit one's preferences. The top cap offers an airflow control design where 3 holes on the ring can provide different increments of air by rotating. The bottom cap provides a thin brass ring that can lock the firing button and also has ventilation for your batteries. Along with the firing button is a center metal piece that can be spun to adjust your firing pin positioning precisely without the effort in unscrewing the button cap.
Main tube only (the one with the logo) is for a 18350 battery fitment. Main tube and small tube together is for 18490/18500 battery sizes, and finally the main tube and medium tube together is for the 18650 battery fitment.
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