Complete garbage - Presma AR Buffer Tube Receiver End Plate Castle Nut

Thought it would be strong and look good, Grooves are rounded so the moment you put any weight to tighten it slips and the material breaks easier then any castle nut I used before. With the crappy material and the rounded groves its a bad time. As well as the thing is so long you cant push your stock all the way in. The black also is more of a navy blue. Would not recommend.