Any shooter looking for a traditionally looking scope will feel at home with this on their weapon. There is an included peep sight that allows shooters to use their iron sights. This base mounts easily to the inside track of your weapon’s carry handle. It also offers waterproof and fog proof protection. Construction-wise it is a solid, single scope body design with a 34mm diameter and an integrated base. This Barska 4×20 carry handle electro sight scope has been designed specifically for use with M-16 and AR-15 rifles. Specifically built for AR-15 and M-16 weapons… This fixed magnification model is ideal for carry handle mounting.