Roller locking is a fully locked firearm action, distinct from roller-delayed blowback. It functions by rollers resting against a central block, forcing them outward to lock the barrel assembly. Unlike roller-delayed systems, roller locking requires an external force, like short recoil, to unlock. This mechanism is exemplified in firearms such as the CZ 52 pistol and the MG42 machine gun.
This expert guide from Forgotten Weapons delves into the mechanics of flapper-locking firearm systems. It details how flappers, attached to the bolt, engage with receiver recesses to lock the breech during firing. The explanation highlights the critical role of flapper size and engagement surface area in system safety and reliability, using examples like the DP-28 and contrasting them with the less successful G41.
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