The Firearm Blog has an article on far lesser known patent filed by John M. Browning. There is no indication this made it to production, but it is a nice interesting article. The comments seem to indicate that Pedersen probably had similar design 6 years prior.
http://www.thefirearmblog.com/blog/2015/11/10/the-browning-1921-autoloading-rifle-a-forgotten-weapon-of-war/
From: The Firearm Blog
