Im not sure how but upon the 4th attempt it fine on the Dr black slide, so now attached and functional, absolutely no complaints, solid design and looks sick on my build
Great makes the gun feel way better with the extra kickback!
[ETiny] PTW Electronic Set[ECU, Selector Board, and MOSFET][For Systema M4 PTW Series]
Cardboard-plastic trash, fell apart instantly
Item as described. Works perfect and shipping was prompt and well packaged.