The LCS cocks by the crank arm(s) at the front end of the cocking rods (16) engaging the machined slots in the shoe of the forend iron itself and rotating them as the barrel & forend assembly is tipped open. That turns the cocking lifters(17 & 18) at the other end that engage and push the hammer(s) back to engage the sears.

I think Numrich has a few too many parts listed for the LCS extractor forend