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Sunday Answer 3-28-15

The bolt and bolt carrier shown in Saturdays post.

IMG_0012sc

IMG_0015scComes from an 8×57 Dror machine gun. Here are a few picture of this weapon.

pattern roon 2 021csc

pattern roon 2 022csc

dror_g3

dror_g2One of the unique items about this LMG is the open bolt operation while on full auto and the closed bolt operation while on semi- auto.

Here is a close up look of this fire control system.

jmoorestuff004-1You can see the full auto sear engaged in the bolt.

2 comments to Sunday Answer 3-28-15

  • S.N.A.L

    “One of the unique items about this LMG is the open bolt operation while on full auto and the closed bolt operation while on semi- auto.”

    http://en.wikipedia.org/wiki/FG_42

    “The FG 42 fired in semi-automatic mode from a closed bolt, accomplished by delaying the release of the firing pin (mounted on the bolt carrier and released by the front sear notch) until after the trigger had been pressed; the short lock time, and little movement in the action during firing translated into greater single-shot accuracy. When operating in the automatic mode, the sear mechanism was designed to fire from an open bolt by simultaneously releasing both the bolt and bolt carrier. This had the advantage of preventing a phenomenon known as “cook off” where the heat of repeated rounds being fired caused a chambered round to overheat and prematurely ignite the powder or primer. With automatic fire selected, the bolt would remain open between bursts to provide maximum cooling. The rotating fire selector switch was situated in the trigger group, above the pistol grip on the right side. The change lever also served as the safety,[10] disabling the sear mechanism when engaged.”

  • Jounizi

    Yes but the Dror seems to be hammer fired. FG42 has similar bolt to Lewis-gun. There is no hammer on it.

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