I’ve got an older Stihl FS250, which is 40cc, that I picked up at a pawn shop for $80. It has handlebars and a harness.

For heavy weeds/stalks, I recommend one of those “tri-blades”. They will sling grass at least well enough to keep from getting constantly clogged. The key is to use a pretty dramatic side to side motion with the machine.

For small brush/trees, I bought one of the blades off eBay that looks like it has chainsaw links on its edge. It works well, but is useless on grass, as it gets bogged/tangled almost immediately.

I wouldn’t recommend the saw blade to folks unless they have the handlebars/harness. Too dangerous if all you have is the small D-handle. Use a smaller 8” blade rather than one of the larger ones, if your machine in underpowered.

I wouldn’t want to clear large areas with one, but for feeder pens and knocking down small trees that are too big for pruning shears, it’ll save you from getting down on your knees with a chainsaw.