Excellent point. I saw on the Blaster Factory website that in order to get the Grenade Cup to attach you needed to purchase 2 parts that connect to each other and was just looking for ways to maybe get away with only utilizing the one cup adapter. (Just trying to keep the cost down a tad). Like you said it may just be more appropriate to buy both adapters and be done with it, then all I will need to do is cut the barrel off and plug and play.