I was checking the gun out last night at work and found out that the take down pin has a metal (round) shaped spring that fits into detentes inside the lower so that should be ok. Also the mag release is plastic, BUT has a metal insert that actually holds the magazines in the weapon. I had thought about reversing the mag release so that I can activate it with my trigger finger. I'll have to shoot is left handed some and see if my finger causes it to accidentally activate. If it doesn't I might just very well reverse it.