The JG Full Metal Body for M4 S-System may be a great top quality metal body and may be a great piece for somebody looking to upgrade to a metal body. This metal body is extremely sturdy and doesn’t exhibit any creak or wobble what so ever. This metal body is formed to be used with a S-System rail and features the required hardware to be compatible with most S-System rails. This body also comes with all the required hardware like the bolt release paddle, magazine catch, and body pins to permit the user to simply upgrade their body.