I am selling and/or looking to trade my tippmann m4. It has a custom air tap in grip. Also has the upgraded RED recoil system in the stock. This upgrade makes the rifle kick much more than stock. Also including a quick detach line and tippman air tank. Attachments ( rail segments, rail covers, vertical grip, riser, and stubby suppressor) are all included. Price is negotiable. Open to trades. Shipping cost depends if trades are involved.