Walther P38
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The Walther P38 is a 9 mm semi-automatic pistol that was developed by Carl Walther GmbH as the service pistol of the Wehrmacht at the beginning of World War II. It was intended to replace the comparatively complex and expensive to produce Luger P08. Moving the production lines to the more easily mass producible P38 once World War II started took longer than expected, leading to the P08 remaining in production until September 1942 and copies remained in service until the end of the war.
Spreewerk manufactured Walther P38
P38 cut-away model
1943 Mauser P.38 barrel showing locking block design
P38 made by Mauser, coded "byf 44" with matching presstoff and leather holster
Recoil operation
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Recoil operation is an operating mechanism used to implement locked-breech autoloading firearms. Recoil operated firearms use the energy of recoil to cycle the action, as opposed to gas operation or blowback operation using the pressure of the propellant gas.
The barrel from a Para Ordnance P12.45, an M1911-derived design which uses short recoil operation. Under recoil, the barrel moves back in the frame, rotating the link (shown in the unlocked position), which causes the rear of the barrel to tip down and disengage from the slide.