If you want to challenge yourself in building a shell-ejecting non-HK416D gun model, try this LDT HK416D Kit as shown by Wang Studio... "This product comes from mainland China studio LDT and is sold in kit form. Unlike the previous version, most of the parts in this version are newly made, and the materials and craftsmanship have been greatly upgraded. I will indicate the new parts below. Except for the parts marked, you need to prepare your own parts, including: gearbox, rear support, iron sights, flash hider, magazine, motor and battery.
The gearbox I used in the video is also the LDT SE System launched by LDT Studio. It can’t launch any material, but can eject shells. The shape is the same as the No. 2 gearbox, but the parts are not universal, so I replaced some parts in the kit .

Kit list:

• New receiver-aluminum alloy
• Receiver Small Parts - Steel & Nylon (Ejection Window Cover)
• Charging Handle - Aluminum & Steel
• New Grip - Nylon
• New fishbone - aluminum alloy & steel (barrel fixing ring)
• Barrel - Aluminum Alloy
• Gas group - steel
• New air guide seat - aluminum alloy
• Support core-aluminum alloy"