The real G3-SG1
The SG1 were G3s that were pulled off the assembly line to be fitted with more accurate barrels/parts. HK decided not to remove the full auto feature. These were designated as marksman rifles, such as the M14 DMR.
Box isn't important, it's just styrofoam and cardboard.
This is a massive gun and weights a bit more. About 7 pounds. Metal where there is metal on the real weapon. Trademarks "Schawben Arms Kal. 6mm" on the mag well, right side. Serial number on the top of the weapon, each number is different. Bi-pod is included and comes off with a single screw. Cheek rest is also on the stock, but I haven't found a way to remove it. The receiver accepts TAPCO/UTG claw mounts and those MP5 low style mounts.
Disassembly is really easy as it uses pins. (Almost like the M16)
Accepts G3/MP5 style claw mounts
HK charging handle (Pull back and up, then slap it down. Aww yes)
Takes Large batteries
Specifications: (Copy paste from Airsoft GI)
Gearbox Type: Type 2(upgraded internal)
Accuracy: 120 feet
Muzzle Velocity: 300fps
Accessed by the charging handle, inside the bolt. It rotates around the barrel instead of the sliding type.
Battery Cover on the butt-stock cracked in half, superglue fixed it.
TAPCO/UTG claw mount doesn't fit unless you file down where the claw mount clamps onto the gun.