Great info.You need to know the pitch, width, and number of drive links. Then you can shop for chains.
Then you need to pick the cutter profile. Full chisel has cutters with a profile that looks like a 7. Semi are shaped more like a ?. Full are more aggressive but dull easier.
Next, anti-kickback safety chain has an extra hump on the non cutter links that makes it not grab as much as it rounds the nose of the bar.
Most saws like yours come with safety chain for a really good reason. I run safety chain on my 50 cc saw because I use it for limbing and any weird position work. The difference in speed isn’t worth the risk for me.
If you want to noodle a bunch, you can get a full skip chain that omits every other cutter. That enables it to clear better.
In general, a 20” bar on a basic 50cc saw will be a lot in hardwood like cherry or maple. You need to keep the chain sharp and let the saw move at its pace.
Oregon chains are available on Amazon if you aren’t in a rush. I just got a new loop of full chisel safety chain for my MS260 for $20 and it worked great yesterday.
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