Things just keep getting better & better.  Take this CYBERGUN AEG rendition of the Sig Sauer 556 for example. The real Sig Sauer rifle is 'ripe' for replication, and you'll certainly be pleased with the results.  Featuring Full Metal upper and lower receiver, gearbox, and barrel, this thing is done right.  The reinforced gearbox incorporates steel gears designed to transfer the energy of the high-torque motor efficiently and ensure longevity of the unit.  Full/semi auto select, functional safety, and adjustable hop up are on board also. Included are a high quality battery and battery charger, two 400 round capacity mags along with a magazine stacking clamp for 800 rounds of "right now' rock & roll (which should get you dry in just under a minute on full auto - assuming you have a prime charge and can change mags quickly).  By the way, rock & roll in this case means 360 fps muzzle velocity with Hi-quality polished .20gm BBs - higher with lighter BBs although not advised (this jewel deserves the best you can feed it).  No surprise the claimed effective range is around 180 feet.  It also carries licenced laser engraved Sig Sauer identification on the pistol grip, mags, and receiver. " Length is 33-36" depending on butt stock adjustment. Weighs in at about 8.5 pounds Comes with battery & charger, 2 (two) 400 round mags plus stacking clamp, and instruction manual.  All in all, a great way to fly first class.