Here's another quick video by Leo of WGC Shop on the 2012 Version of the VFC Colt M4 RIS Gas Blowback Rifle. He says that the lower receiver has been improved for durability and the bolt is the same as the HK416 GBB they made for Umarex. There is a CQB-R version so you've got two choices. It's now in stock at WGC Shop for US$329.00.