The O.S. 30 has an ABL sleeve, no where near as durable as ABC construction.
The O.S. 30 has never impressed me with it's performance either. The LRP .28 is stronger IMO.
Try out the new LRP .30
SH does not make bad engines, they are fuel hungry but they make power and tune easy.
Edit; Also keep a close eye on the main bearing in that Axial. They use a very cheap bearing with a piece of plastic holding the bearings in place.
I took one of mine apart for inspection...As soon as I removed the crank ball bearings started dropping out!
The front bearings are really leaky too, I put the double sealed Mach .26 front bearings in my Axial.