Just one huge thing for me, in my first year of airsoft... It was a cold november day, I had my Cadpat M4 RIS in a game... Went for a run, slipped on a patch of ice. I tried to bring the gun on my lap while falling down but I didn't do it fast enough and the stock made contact with the ice... before my body.
Got back up, started firing at tangos and it's only then that I realized the weird sound my gun made, as well as the lack of shoulder contact with the gun... The Cadpat painted metal body snapped, the stock screw made pressure on the spring guide and the back of the reinforced V2 mechbox broke.
Didn't take pictures of the exterior damage, but here is the before:
http://k53.pbase.com/o6/42/561142/1/...RISCadpat.jpeg and after:
http://i.pbase.com/g3/42/561142/3/53...edbyspring.jpg