Quoted from Sonic:
Haven't put mine on yet - if I remember, you gotta take the Battlefield off the hinge to get that screw on the left/back off? Is that what everyone's been doing?
The above post right above mine is pretty spot on. For some reason, my Shadow's PF rails DO NOT make it all the way to the lockdown bracket, so my PF tends to "slide back in" and not rest on the PF lockdown bracket, making it an even more "oh crap" moment. The first three are easy with the mini-PF up. The back left one is a special kind of hell. I have a racheting crescent wrench, so it was bearable to get off. Getting that back on.... yeah, nope. Three is good enough. I have the shroud and the mini-PF's mounting hole lined up for whenever I am nuts enough to try again, but again, with my PF not being able to securely rest on the lockdown bracket.........nope. I tightened the other three real snug, and it ain't going anywhere!
Right after I did this, I made it to Final Battle!!! Was 9 shots away from completing it : (. But that was the first time I made it that far. What a rush!