I saw on a chart, with regulator pressure at 2,700 psi ( think it was .22 caliber) , you will get 7 shots at Max of 41 FPE. I have the GK1 V2 and that puts out over 80 FPE in .25, 42 grain for the first few shots and stays over lethality the rest of the mag at Max setting. That gun RIPS. I shoot ¹⁶ to ⅛ steel targets and put holes through them the full mag at Max. Wait for all the reviews when it comes out. Macabee speed and airgun Alley both do great reviews. If you only get 7 shots at Max regulator pressure and have to refill after that every frigging time, that's gonna leave a sour taste on PCP guns. I have a little tablet bag that I bought that I carry the GK1 in. I have about $2,000 invested with all the extras. 2, moderators, stock, new grip, rubber grip cover, fill plugs, gauge cover, holographic with laser dot attached, the tank cover with M lock, super bright light and strobe. It all fits in the bag. It's a bad ass gun and powerful. You won't get all that right away on a new gun. Make sure this new one is really worth it over the GK1. I also have the megalodon in .58 with the 22 inch barrel and the .50 in the 15" barrel. The 15" fits perfect in a back pack without the rear tank attached and definitely my favorite gun. I have the Donny FL EMPEROR moderator that didn't work on another gun but worked awesome on this one. Makes it MUCH quieter. Can fit the gun, rear tank and moderate which is as long as the gun itself in a back pack and that has a ton of ****ing power. If you've never owned a PCP gun, I'd recommend that number 1. It's a very fun gun and can be easily carried around without anyone knowing. You only need a compressor that goes to 4500 too. The Gk1 fills to 5000. I had to buy another compressor at $600 to fill it without having to man handle a hand pump for that last 500 psi. Whatever you choose though, I hope you're happy with. These are great guns but they're pricey and takes time to free money up for them. Hopefully this helps you not get a bad experience with your first gun!