Won't even fit on ar - Tacfire AR15 Receiver End Plate With Ambi Qd Sling Swivel Attachment

These things are nothing more than paperweights. The QD attachment sites protrude so much that you cannot tighten down the buffer tube. This makes these things useless. Trying to even get these tightened down close enough, it broke the rear take down pin spring. On top of not fitting or being made correctly, they are so heavy, like way heavier than they should be. Product is garbage, save your money