The Hobby Store 75 offers a versatile carbine kit for airsoft enthusiasts: the 3D Printed USW PRO Kit for Glock GBB pistols. Choose between the DIY kit or a fully assembled option for your convenience. This kit transforms Gen 3 and Gen 4 Green Gas Airsoft Glocks (with potential compatibility for Gen 5 Glocks) into powerful carbines, compatible with popular models like the G17, G18c, G19, G23, G34, and G35.