Took a chance on a new core 15t boy am I sorry!! upon opening box I noticed a few problems. Let me start by saying this a brand new unopened gun, I posted pics you will see problems barrel m4 feed ramps do not line up with receiver, rail support is improperly installed and top of rail is off to the right. Spoke to customer service sending brand new unfired gun directly back to there facility in Florida. Buyer Beware!!!