Getting a full size TM M16 is silly. You wouldn't have to aim because you could torque the barrel left and right and just hose the area down. If you thought barrel wobble was bad on the M4...
CA internals are fine. For starters the bushings are metal, so is the spring guide. The gearbox is supposedly "reinforced" but a V2 is a V2 is a V2. Try to stick a Systema M160 into it and you'll get the same results (broken) as with a TM. The spring is also stronger in a stock CA by anywhere from 10-30fps depending on the gun.