Advertised as a fast-handling lever-action carbine. Chambered for .219 Zipper cartridges flat trajectory, varmint-type round. Has 20" heavy barrel, which was the feature that doomed it to failure as this was too short to coax maximum performance and accuracy from cartridge. "MicroGroove" rifling that was used did not yield long barrel life; model survived from 1955 through 1959, when it was discontinued. Externally similar to 336SC. NOTE: First few thousand Zippers were made in standard weight barrels, not heavyweight. These are scarce and found in "M" prefix code number. Add 100 percent.