This is a Newbie question. I recently acquired a M&P 15X with the railed hand guard. It came with ergogrip rail covers, but I cannot figure out how to install the covers. Do they slide down over the rail or clip on??
Not familiar with ergogrip, but Knights rail covers slide on, there is a little grabber doohickey at one end that you have to push pretty hard on to get it to slide without grabbing.
