For my first electic marker, this worked great. Gassed my tank , and it was ready to go right out of the box. Took me less than 2 minutes to chrono it too.
The battery was a sinch to remove. When you place it in the gun, put the clip towards the back of it. To remove, take the cover off, turn the gun upside down( so that the battery is facing downward), push it on the clip end towards the back so it angles out at the front, and tug. My require a few attempts to get it just right.
Broke quite a few balls down the barrel, but it was raining and humid that day, so I suspect that weather was the cause.
I love this gun. Was really skeptical of the Electric marker and Nitrogen market, but after this gun, I may never go back to CO2. Now if I can just rig my VM for Nitro........ :-)