['ol shooter]

Nice find, it's in better shape than my pawn shop Glenfield 100G was. Some stock refinishing and metal TLC with 4-0 steel wool and oil, followed by a good touch up blue will work wonders. I have never heard of straight cut rifling, but have read about smooth bore .22's of differing brands here on RFC. Here are a few pics of mine before and after, the metal responded well to Brownell's Oxpho Creme touch up blue. Take pics before ,during, and after, we all like pictures. It will give you a lot of satisfaction when you have the old girl back in good shape again mechanically and cosmetically. Mine shoots very well.
Before

After

Before

After

 

['ol shooter]

Is it corrosion or lead? A few passes with bronze wool on a used bore brush will scrape leading out, if it's corrosion maybe an abrasive like JB Bore Brite would help a little. Found a Model 10 barrel here if you are interested.

Marlin Glenfield Model 10 Micro-Groove Barrel | 22-Inch | Bolt-Action .22 Caliber Rifle

You are considering a vintage Marlin Glenfield Model 10 Micro-Groove Barrel. It's in excellent shape with only light wear from usage, storage, and handling.

oldarmsofidaho.com

 

['ol shooter]

The finish comes right off with Citristrip and a gentle scraping with a plastic putty knife. I washed my stock down with real mineral spirits, it cleaned it up real nice.