Well there are many different sling plates from places like GG&G, GRSC, knight, DPMS, Daniel Defence etc. I use the GG&G plates from gggaz.com. I use the ring model. Some people have mentioned that the GG&G plates that are the slot model have the slot higher than some other manufactures and some people like it as it keeps the rifle positioned better, other people don't care for it as it more likely to interfere with the charging handle. I use a loop type attachment as I like being able to take the sling of and on easy as well the feel of there be a "joint" of flex point between. I get my single point slings from grsc.com.