TechT makes the FINEST upgrades for Smart Parts and GOG Brand Paintball Markers. Fun FACT for ya, the same guys that owned and operated Smart Parts, now own and operate GOG Paintball. So if you liked SMART PARTS products, you will love GOG products. Its the same people just with a new name. We make great products for both brand products! If you made it this far, you would one of the enlightened! Congratulations!