Wrong, Giz.
Read up on it. I'm not saying he invented the lever action- just the good ones. A 66/73/76 type and the guns with vertical locking bolts are quite different in design, and the verticals are JMB all alone. He did not tweak anything but his own designs.
After Winch found the SS, and hunted Browning down and bought the rights, JMB saw an ongoing opportunity. He kept designing guns, and taking them to Winchester. They bought the ones they wanted, and bought the ones they did not want to keep others from getting them!
He took Win the A-5, and they finally turned down a design, thinking the public had no interest. He had ridden a train to take it to them. He decided to take it to Rem. While he waited in the office to see the pres, Hartley (the pres) died of a heart attack!
He simply wired home he would be gone longer than he had forseen, and bought a steamer ticket to Europe to take it to FN, whom he had dealt with on pistols.
They made the A-5 for him, and Browning Arms was truly born with that gun.