I recently set up my 261C with the same 7 pin sprocket, 20" long bar and 3/8" x .050" chain I use on my 362C and 441C. This simplified my inventory of chains, bars and files. The 261C with 20" bar and 3/8" chain is a bit slower than the old .325" x .063" chain and 18" long bar but it still cuts...