okay, i think i might know what the problem may be. I took a picture of how the bb's are being fed in the hop. I took a picture of this directly from behind
As you can see in both pics, there is one full bb in the barrel and one underneath it. Do you think the bb at the bottom is causing the top one to be stuck when the trigger is pulled, and hence, no bullet flies out during the first shot? or maybe this is normal..