We stopped at the Browning Firearms Museum in Ogden, UT on the way back from a trip to western Idaho a few days ago. It isn’t real large but very well done, and it had some fascinating displays that included a number of Browning’s toolroom models of his designs. One especially interesting one was his first gas operated automatic weapon. It was an 1873 Winchester carbine with a “flapper” at the muzzle and a rod connected to a modified lever. They say it actually worked well.
They also had several early versions of the BAR including the first one. It actually ejected out the top unlike the finished version that ejected out the side.
Of course, they had lots of his machine guns as well.
All in all, it was a really fine little museum. I recommend it highly if you’re in the Ogden area.