On Saturday I was able to test the Shockwave C & P "SUO" H&K Lower on my Century Arms C93 Sporter (HK 93 Clone). It was very easy to install and guess what...?...It worked! No tweaking, adjusting, messing around with anything! The grip is really nice and a major improvement over the Navy style lower. It made the rifle a lot nice to look at, and more importantly, a lot more fun to shoot. For $50, you can't go wrong. I definitely recommend this upgrade.