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not a 'smith, but.......
Gosh, "failure to fire" should be fairly easy to resolve , not a gunsmith, but here goes.........
-good ammo?
-clean and lubed?
-weak hammer spring?
-damaged/shortened firing pin?
-and finally, could this not be a bolt/firing pin/spring issue at all, but instead a
headspace issue. ....... worn bolt lug, worn locking recess on the barrel extension, maybe something wonky with the barrel attachment/fitment. Ya might try a different barrel, just for grins, or find headspace gauges for 20 ga?
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