My friend brought are Airsaber together on clearance from .midway last year. He has the double barrel..I have the single...I got him to buy the same UTG crossbow 130 bdx scope also....I'm having good luck shooting my single barrel to 120 yards with both Easton and Umarex arrows...My friend is never going to use his double barrel X2....I'm sure he would let me setup the UTG BDX scope and arrow combo for.him. If you want me to ill shoot it to 120 yards with Umarex and Easton 2219 arrows. Shooting tethered and fps for you. Accuracy and Velocity comparison....???????