[TokyoSeven]

Originally Posted by LightBulb

Would you consider this under blow back? It doesn't actually blow back but the bolt catch works. Think this would interfere with the gear box?
http://shop.ehobbyasia.com/king-arms...m4-m16-de.html

That system is for a standard v2 mechbox. Electric blow back mechanisms are integrated to the mechbox and not a part of the receiver. The functioning bolt catch on the item you listed is merely for added realism.