This thing is literally more robust than my real steel F5 stock. I had to change the geometry of the locking slot plastic a little to get it to unfold without binding, but overall this is very much worth the money. And in case anyone is curious, yes, it does fit other "models". Just needs a buffer added. If you're resourceful, it's an easy job and worth the time. It looks and functions awesome. Just be warned, Ehobby shipping is terrible. Took nearly a month to receive my order.