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The TechT Paintball MRT Delrin Bolt for the BT TM7 and TM15 markers is only 6.5 Grams. Lightening the bolt means that the marker will naturally have less kick/recoil and take less pressure and time to move the bolt back and forth. This means your marker will produce less vibration and recoil with each shot. This in turn allows you to stay on target better ....hence shoot more of your opponents. TechT testers also said they experienced better accuracy and increased shots per tank over the stock bolt.