OMPHOBBY M4 Helicopter Battery Rail OSHM4022 Sale! from 584 /per Qty. Add to Cart This item is a recurring or deferred purchase. By continuing, I agree to the cancellation policy and authorize you to charge my payment method at the prices, frequency and dates listed on this page until my order is fulfilled or I cancel, if permitted. This is a replacement battery rail for the OMPHOBBY M4 Helicopters Contents Battery Rail-1Socket cap screw M2.5x5-6 Qty available:1 SKU:OSHM4022