Mil-Spec steel Castle Latching Nut 223/5.56
fit the Mil-Spec & commercial buffer tube
fits perfect, no problem
Standard castle nut....but at this price and if you build, you need some of these. I've used a few now and they are as good as any if you want just a standard castle nut. Stock up!
Great nut at a super price
Standard castle nut. Didn't like the shiny black paint, prefer a flat color but had planned on repainting anyway. All in all, a good part.
Fit with no issue and was of good quality