Checkout the backside of the close up of the top of the mag. You can see the little tab that on the M4A1 PTW trips the bolt catch and stops it from dry firing, so maybe it is just the protos.
I also find it strange that SystemA decided to put their 480 motors in the MP5, they are promoting the 490's in the M4A1's like mad and all 2008 PTW's and a lot of late 2007 PTW's came stock with 490's.
Last edited by LUTNIT; February 27th, 2008 at 23:06..
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