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Fring Pin Holes -Question

Discussion in 'Uncategorized Threads' started by wineguy, Jan 12, 2008.

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  1. wineguy

    wineguy TS Member

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    Sep 8, 2006
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    In a recent posting a description of enlarged firing pin holes was mentioned with regards to evaluating the overall condition of a used gun.To a novice it would seem that the firing pin and the hole/channel that it moves in would be precise, non wearing componets. Please explain how the hole enlarges.Is it due to a "floating" pin.
    Thank you, BB
     
  2. hmb

    hmb Well-Known Member

    Joined:
    Jan 29, 1998
    Messages:
    9,412
    There are a number of ways the hole can get enlarged. The pin moving back and forth in the hole covered with oil and abrasive grit(dirt) wears away the metal is one way. Another is when closing an o/u type action the firing pin protrudes a litte and gets hit by the rim of a chambered hull, the pin which is very hard bangs against the hole which is soft enlarging it over time. HMB
     
  3. BL350

    BL350 TS Member

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    Dear WineGuy,
    Firing pin hole wear is caused by several factors. First & Foremost, examine an over/under receiver and notice that each pin comes in at quite an angle from the surface of the actual shell case. So when the hammer falls, the pin is driven straight ahead and actually strikes the primer at an angle! The firing pin of course is giving the side walls of its hole, a tremendous angular load. If not cleaned and oiled on a regular schedule, wear increases. Not cleaning these holes and oiling regularly leads to excessive wear. If you plan to shoot a lot of targets each year, learn how to remove/reinstall the firing pins and this will greatly increase the life of these critters.
    Narrow design O/U receivers such as Perazzi/Rem 3200 etc. have these steep angles in order to give you better visibility and balance. Even break open single barrel guns have some firing pin angle. Did you ever see a Model 12 or 870 wear a hole? Not I! Because the pin strikes the the primer @ 90 degrees. But dirt and failure to clean regulary produces other problems which lead to misfires etc. Pick your style of gun and get to know its good points and how to clean it! No shotgun will survive long without proper cleaning.
    sincerely......Jet Boat Bill
     
  4. B.C.

    B.C. Member

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    Jan 29, 1998
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    Also blow by from enlarged primers is one of the most contributing factors ! IMO B.C.
     
  5. GunDr

    GunDr Well-Known Member

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    It's highly unlikely you'll ever see an enlarged firing pin hole. More likely, the firing pin hole will begin to squeeze shut. Loose steel primers hitting against the breech face, will cause a little "doughnut" shaped depression around the holes.

    Perrazi's and the Rem 3200 are the most coomon guns you'll see with this.
     
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