Like our upgraded bolts for the Mini and Axe Markers, the TM-7/ TM-15 Bolt pushes the limits of weight reduction and the ability to achieve lower operating pressures. By lowering the amount of moving mass we are able to pair the TM7 / TM15 MRT Bolt with our MRT Spring Kit to achieve lower pressures and get substantially less kick from the marker. Players are left with a quieter, smoother marker that is sure to get them more kills on the field. Our Bolt utilizes the stock style bolt tip o-ring. During development of the MRT Bolt we found that by not incorporating this o-ring into the design, considerable consistency and efficiency were lost. We have also include an additional set of o-rings to ensure a great bolt guide fit. The TM-7 and TM-15 are great markers that boast some of the best, if not the best consistency in the paintball industry. By adding the MRT Bolt Series to your marker you make a great gun even better. The TM-7 / TM-15 comes with TECHT's Lifetime Warranty.