Just about all KR series aircraft recently built or being built have fixed gear. The original retract design was very short and not very sturdy, having folded up on several pilots upon landing.
I'm building a KR2S, which is the stretched version of the KR2. Mine is also stretched even further, which will contribute to stability. The KR2S is inexpensive to build and very durable. Being completely plans built, it is also easy to customize. Mine is going to be a few inches wider and be powered by a .060 Corvair 2700 engine.