Sumatra carbine. 6 pounds without scope, pretty short, adjustable power for different pellets, very accurate and powerful. Plus it has that sexy Korean look. LOL
There are lots of PCPs that meet your requirements, however you forgot to say how loud or quiet does it need to be? If money is not an issue I would pick an Air Arms s510 carbine with a regulator, you can easily get 40 shots per fill and enough accuracy for 75+ yards shots and since we are talking Air Arms, quality will be top notch and you will love it I can assure you that If you want to have a better deal you have to take a look at the Hatsan at44w-10 I have one and get 20 shots per fill from 190bar to 140bar (33fpe) and all of those shots are inside an inch @50 yards in field conditions and with human error (actually 19 shots are inside 1", I have to admit I pulled a lot of shots). However it is not an out of the box rifle but it is really easy to get it shooting as mine or even better, if you don't want to mod the rifle you still get a pretty solid rifle which gives you around 20shots per fill but with less consistency. I am 15 years old and I have a massive BSA scope on top of mine (1.5lbs) and I can hit spinners offhand all the way out to 40yards, but a lighter scope would be better.My third option would be a qb79 with multishot breach, I'm actually waiting for mine to come in (without the multishot) the reason I bought it is because it is so easy to mod, gets a ton of shots, is accurate and it is very light! I admit I will miss the multishot capabilities from my at44 but that can be fixed by buying a multishot breach which I may do. Airgun Depot sales them for around $105 and you can get 10% off with free shipping, you will need to tune the gun to met your power specs, if you decide to buy it take a look at these posts. > http://www.gatewaytoairguns.org/GTA/index.php?topic=49943.0 >http://www.gatewaytoairguns.org/GTA/index.php?topic=85896Since you want a light rifle because of your age I assume you don't want to pump, here is a sweet deal on ebay for a scba tank >http://www.ebay.com/itm/Drager-4500psi-SCBA-tank-45-minute-carbon-wrapped-Unused-2008-mfg-date-65-5-SCF-/231312000514?hash=item35db450602:g:pd4AAOxyhS9Th9oo You will also need a fill adapter which you can buy from Mac1 or make your own for less than $100 bones.Good luck,Pablo
Interesting, so few responses that say "My USAR is....." but lots of try this one. What is your USAR?