US Patent No. 421663 is similar to the previous Browning design, a striker-fired pump action shotgun featuring a tilting bolt.

In this design the rear of the breech-block abuts the receiver to lock the action. The rear of the breech-block is raised to disengage the receiver.

Inventor: John Browning, Matthew Browning

Patent Attorney: John Earle

Assigned: Winchester, June 1889