Airsoft Mike goes over the M4 blowback rifle from Tippmann that can be powered with either HPA or CO2. If you want one, make sure you have a competition lock so that you can be allowed to play at game fields the require such... "Today is a first for this channel. The first time I have ever owned or unboxed a CO2 & HPA M4 primary, and the very first Tippmann product! Huge thanks to G.I.SPORTZ / TIPPMANN for sending this package out to me."