I use a Ciener bolt covnersion kit with BDM mags in my AR15 and it runs wonderfully. In ~500 rounds it's only jammed maybe twice, which is pretty good by .22 standards. The reason that I like it is that I can use the same upper, with the same optics and everything, for cheap practice shooting. When I tested it out from the prone position at 25m, it even kept the same zero with the EOtech as the 5.56.