action, delayed blowback

A delayed blowback action is a blowback gun design where inertia assisted by a mechanical mechanism lengthens the time between primer strike and the bolt unlocking.

Delayed blowback is the system that keeps the bolt locked until the projectile leaves the muzzle. At this instant an unlocking mechanism, responding to some influence such as recoil or propellant gas pressure, releases the bolt thereby permitting blowback to take effect.AMC Pamphlet 706-260

I need to do more research into the different types of mechanisms used to lengthen the time between primer strike and bolt unlocking, and the guns that use them. The types that I have so far are:

    • chamber-ring,
    • gas,
    • hesitation lock,
    • lever,
    • off-axis bolt travel,
    • roller,
    • screw, and
    • toggle.

While I have some, I do not have enough information on each of these to break them out into their own entry yet. When I find more info I will update.

aka:

    • retarded blowback action

related:

    • possible future entries:
      • action, delayed blowback (chamber-ring)
      • action, delayed blowback (gas)
      • action, delayed blowback (hesitation lock)
      • action, delayed blowback (lever)
      • action, delayed blowback (off-axis bolt travel)
      • action, delayed blowback (roller)
      • action, delayed blowback (screw)
      • action, delayed blowback (toggle)

guns that use a delayed blowback action:

    • . . .

 

Footnotes / Sources:

“Glossary ⇒.” Sporting Arms and Ammunition Manufacturers’ Institute. Ed. SAAMI’s Technical Committee. Web. 15-18 Jan. 2011.

The Franklin Institute. Engineering Design Handbook Guns Series Automatic Weapons. Comp. Engineering Handbook Office of Duke University. Washington DC: United States Army, Material Command, 1970. Print. AMC Pamphlet 706-260.

 

Question:

    • Do you know of a gun that uses a delayed blowback action that is not on the list?

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