Excuse me? No offense, but no. Absolutely not. Plexiglass is a fantastically strong material. Small pieces won't budge, large pieces will bend, but it's almost impossible to break. Throw a brick at a plexiglass window, and it'll bounce back at you.Impressive, though I question the use of plexiglass for a replacement catch. It is probably weaker than the stock ABS one...
ABS, in the grand scheme of things, is fairly weak. for a toy, it's fine. start suping it up, and it won't be fine for long.
Have a sizzlin' day,
AJ