Let's see....I love my AK's. I've got a CYMA AK74 that I reshimmed and put a G&G motor and a tightbore in that is fantastic. My plain jane G&G AK74 is really nice too. I haven't gotten the chance to really make allot of use out of my VERY upgraded CYMA AK74U yet, but it seems to be very promising. Right now the 74U has AIM auto-shimming high torque gears, Matrix Magnum motor, rewired to 14ga copper wire, M110 spring, polished cylinder, sealed cylinder head, #14 0-ring on the piston head, G&G piston and ported piston head set, 7mm bearings, AIM o-ring air nozzle, G&P ultimate accuracy hopup bucking, and a polished and sealed 6.04 tightbore to list all the internal upgrades. Externals are a 249 style pistol motor grip, skeleton stock wrapped in OD paracord, set up for a MissionSpec 1-3 point sling, aluminum CNC RIS, magpul RVG, stubby silencer, and an aimpoint T-1 clone red dot sight. This thing will more than likely be my new 'baby' when the replacement red dot comes in (other one broke).
After my AK's, I've gotta give it to my WE M14 GBBR. I threw an upgraded 'h-nub' style hopup bucking in it along with a RA Tech 6.03 tightbore and modded it to shoot semi only. Threw a 4.5-14x44mm mildot scope on it too. It shoots plenty hot enough to be a DMR which is why I made the semi auto mod. The range is great, the accuracy is great, and the realism when that thing fires is just second to none. I've never had any gas efficiency problems out of it other than in cold weather. The fact that it is gas and IS suscepable to cold temps is the only reason it's not my #1 go to gun.