Hi Charlie21
FC stands for full crank - meaning the engine has a bearing at both ends of the crank shaft, half cranks have one so there is a cantilever effect. Having 2 bearings result in longevity, smoothness and less vibration.
Your silver streak is FC, the other is HC half crank (which we generally refer to as PT - PowerTorque
Also
https://www.bigw.com.au/product/supercut-blade-bolt-kit-victa-18-inch/p/501179/ . Made by GA spares - half the price of bunnings
Penetrene pressure pack is $20 at Bursons - but is worth every cent
I have personally had really good runs out of cheap tools like ozito, xu1, kmart performer, aldi. But I take care of them - they aren't hardy like metabo, Hilti or old Makita's
