I’m finding conflicting info on whether this QD receiver endplate has rotation limiters or not - some places say no, others yes. (Of course, I ordered one after reading yes in a few places and then found the no sources - but I can still cancel.) LaRue says yes, Troy is silent, others say no.
This one: http://store.troyind.com/OEM_M4_Battlesling_Mount_p/smou-m4s-00bt-00.htm
Anyone have one that can comment?