The G3 sights are so rugged, I never needed to adjust them, once set. They have a notch for 100m, and three apertures for 200, 300, and 400. With any sort of rest or sitting, a soda can at 100 or a gallon jug at 400 is a cake shot.
The modularity, stock swaps, forend swaps, snap on folding bipod, QD telescopic sights are all great.
The best feature is easy of maintenance. No small parts to lose, no looking for a clean cloth to lay out the weapon. Just pop two pins, pull off the buttstock, remove the entire boltcarrier with bolt, spray it off or slosh it around in gasoline or kerosene, wipe it off, oil it, scrub the barrel, and snap it back together.
The proof is those TV shots of warfare in the Sudan and other parts of Africa. You see some old rifles being used, made in the 1970s, no spare parts, no gun cleaning supplies.... CETME, G3 and AR-10.
