Also one thing I've noticed is that the chamber is much tighter on this barrel compared to previous 870s (Wingmaster/Express) and my Benelli Nova. Normally I use fired hulls and cut the crimp off for snap caps. Modern shotguns cycle them fine, but I found only Federal hulls would fit. Remington, Kent, Winchester all had too thick base rims to feed. Just tighter tolerances back then, but was kind of funny thinking I'm getting 'sticky chamber' in these guns, but for the opposite reason, due to tight tolerances.
Another observation is that the ejector actually sticks out much further, like a real, heavy duty piece of spring steel. Modern 870s, the ejector is much more flat against the receiver wall.
And out of curiosity, this model sold for $68.95 USD in 1955. Accounting for inflation that's about $655 USD in 2018. Modern Wingmasters are $800-1000 these days.