This is my modified airsoft AEG M4. It was originally 150 fps now it shoots around 300 fps. It took me around 1 weeks to build this. I used all the parts from the original gun except the tape and batterys. I did this because i dropped my gun and the barrel broke so it wouldn't stay then I lost my battery and charger.
All parts except for tape and batteries from real gun
Shoots way faster
Extremely long lasting battery
Could be modded to be more or less powerful
Batteries cost a decent amount
Could fail on the wiring (by this I mean cutting the wires to short or using the wrong wires)
Could get zapped (I am not smart and got zapped a lot!)