i just installed a Kobra red dot on my M4. i am using a carry handle scope mount.. the kobra is great...but it sits way to high. would need a cheek rest then i wouldnt be able to use my iron sites. if i mount my kobra in front of the carrying handle would it be the correct height? to high/low? would i need a riser? CDNN has a BEC weaver mount for $40. anyone got this set up?