Beretta would be a place to start, then want ads, gun shops, gun shows
Contact Beretta, buy R.L. Wilson's book or provide all the markings and a detailed description.
Some people do believe that it is worth your money to buy the Beretta Extreme 2 with the kick-off system. Others do not.
Only if the airgun has a scope rail designed into the gun. You will also need an airgun scope not a firearms scope.
Midway has them
You must buy a special scope mount.
I have owned a beretta xtrema2 for about 4 years and have never had a faliure(remember to oil). I have taken it duck hunting, quail, dove pheasnt it is a great gun. You can even buy a slug barrel for it and easily mount a scope. But for the benelli I used one temporarily but it always jamed because of the inursura system if you use really heavy rounds you'll be find but sometimes you have to use light ammunition. In my opinion I fvor the beretta.
strike of neos is by far the best booster pack for elemental heros you could get neo-spactions in that too. and it's named after elemental hero neos which is also quite reassuring. either that or you could buy an elemental deck. booster packs are good for costimization though. hope this helps!
Browing catalog
No
You can buy a longshot scope with 2 clips at certain Targets. the only Nerf scope is the longshot scope. I would buy a real scope at wal-mart for $5-$10 (i would recommend a 3x or 4x scope). The longshot scope can't even zoom into anything. It is just like a pipe on the top of your gun. Even though a real scope can fit on the gun, i would tape it on.
see ebay