PTR makes a quality version of the HK 93 in 223. I had an original HK 93 back in the day, and it was a nice rifle, accurate and reliable. The delayed roller lock action is stupid simple, field stripping is easy, but the fluted chamber is hard on brass if you are a reloader. Also, magazines are harder to fins then with the much more common HK 91 / G3 model in 308. Kel Tek also makes a semi called the SB something that people seem to like. There are several variants of the AK 47 in 223 out there. I had the Romanian version. OK to play with, but not very accurate or well made, though it was reliable.