Yes, Frank makes the ring with notches that go over the pin in the piston. Frank recommends zero end gap with his rings. I have used many of his rings set up with zero end gap and have had no problems whatsoever with ring butting. The aluminum cylinder grows as it heats up, and Frank uses a top quality cast iron in his rings. It works with zero gap just fine. As I mentioned, in other engines in this size range the factory specified gap is .003". Measure a stock Ryobi ring gap and you will find that it is around 10 times that.

Other than an 11mm venturi carb and a good muffler, the very next thing I would recommend for a Ryobi would be a Frank Bowman ring. (Don't forget that you have to either tap the pin in the piston down halfway into the ring land, or grind it halfway down.)

AV8TOR