This week's slow motion gun is the Frommer Stop, put into production in 1912. The Hungarian designer Rudolf Frommer was responsible for a series of long-recoil pistols, of which the Stop was the last and best. It is chambered for 7.65mm Frommer, which is identical in size to the .32 ACP, but loaded slightly hotter. Stop pistols will generally run reliably on .32ACP as long as it isn't underpowered. Anyway, it was a far over-engineered design, with a 3-lug rotating bolt to lock, and a long recoil action. It was adopted by the Austro-Hungarian military and saw service in WWI. The other long-recoil firearms that saw commercial success were the M1915 Chauchat LMG, the Remington Model 8/81, and Winchester Auto-5.