Some airsoft retailers add value to the products they are selling by pre-uprading them, convenient to some customs who prefer to upgrading their airsoft guns before using them. In this video BadaBingPictures show the Umarex/SFC Airsoft HK MP7A1 GBB... "SFC Airsoft sent me this KSC MP7A1 GBB SMG to review. They sell pre-upgraded airsoft guns, so all you have to do is load them and shoot!"