I am building a 2nd upper for my m4. So far i have the upper receiver, outer barrel, gas block, gas tube, and all parts for the rail system. I am getting a brass tube and parts for the hop up. It will be a close bolt system.
My question is, what parts are included in the ra-custom package, such as the one here:
http://www.ratech.com.tw/store/produ...?id_product=83
I would like to make sure about this before ordering other parts I am going to order.