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Additional resources for 20 mm. A.A. Gun

Example text

Figure -13. t! formed on the barre( spring c=sin~. The trunnions fit in holes in the breech bars. o:gged •pring pins fasten tbe breech bars to the larrcl spring osing trunnions a: c=:e fron t. and to the b:eech boit cotter at the rear. See F'igure 13. t\ew type breech b~r securing bolt retainers (2g9666-4) made of round wire are now used. Instructions covering their installation and removal may be found on Page 135. d left breech bars have hardened stop plates thaL contact the double loading stop whenever a portion o( a corn cartridge c~se remains in the firini chamber under the double loading stop pin.

Sear. pt

At the front end of the trigger crank (Yellow} is another toe that lies under a lip a t point (P) o{ the parallelogram top lever (>1} . ogram top lever {N) causing it to rotate about its axis pin and forcing the parallelogram to slew into the position sho wn in Figwe 28. }. T he fro nt end lugs (Q) of parallelogram bottom levers that PA GE 42 CHA PTER 4 TRIGGER MECHANISM TRIGGER INTERMEDIATE LEVER TRIGGER PAWL TRIGGER DOLT SAFETY CAM FRONT TOE Of TRIGGER CRANK TRIGGER CRANK PIN ON PAWL HOLDER Fiaure 27-Trig~er to ttiaeer Cr3nk opera tion FRONT TOE OF TRIGGER CRANK N M BREECH PAWL figure 28-Rccoiling maS$ 3bout to be rele:tsed to fire the aun.

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20 mm. A.A. Gun

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