Just thought I'd let you know that the BAD-EMMR is not compatible with the AXTS AX556 lower. The way their specialty parts work when you tighten the mag release into the mag release button you cannot get it tight enough and vise versa when it's tight enough (still loose in my opinion) the pass through sticks out just a little too much and you can't slide the extended finger pad into place. I was disappointed because this is a very cool add on as far as function and looks. I understand not all products play nice together, I've experienced this before with this lower I can only use your rear enhanced take down pin and I love those too. Just thought it would be good to give a heads up to all with AXTS lowers. Maybe it's time to sell it and switch to the BAD556-LW lower, then I'd have no compatibility problems.