Jump to content


Photo
- - - - -

What Is The Min Length Of The Firing Pin?


  • Please log in to reply
6 replies to this topic

#1 JimFromFL

JimFromFL

    Long Time RKI Member

  • Regular Group
  • 1877 posts
  • Gender:Male
  • Location:Florida

Posted 01 January 2004 - 10:47 PM

When do you know its time to replace the firing pin?

Is there a minimum length of the firing pin?
  • 0

#2 bug

bug

    Long Time RKI Member

  • Board Benefactor
  • 1480 posts
  • Gender:Male
  • Location:SE PA
  • Interests:Hunting, fishing, shooting, reloading, metalworking, woodworking, photography.

Posted 02 January 2004 - 08:26 AM

Phil, those gauges do exist and there is a spec for pin protrussion. Unfortunately I have neither. I had a problem with my Savage 28 while using Fiocchi ammo. The gun will run anything else but I get 30% FTF with it. Soneone told me "hard primers". Now I use mostly S&B.
  • 0

#3 PK.

PK.

    Technical Expert

  • Board Benefactor
  • 1567 posts
  • Gender:Male
  • Location:CO, USA
  • Interests:Full time gunsmith who loves Thompsons, 35+ years experience.

Posted 02 January 2004 - 11:47 AM

3.071 according to the Colt print (may have been revised in latter Military production).

If the head space is not correct or the ammunition is short it won’t matter if the firing pin is right or not. Every detail must be taken into account when troubling shooting a problem like failure to fire.

  • 0

#4 JimFromFL

JimFromFL

    Long Time RKI Member

  • Regular Group
  • 1877 posts
  • Gender:Male
  • Location:Florida

Posted 09 January 2004 - 11:02 PM

Checked mine and it was 3.070.
Had a new one on hand and it was 3.073.

Looks like a good time to replace the pin.
  • 0

#5 Z3BigDaddy

Z3BigDaddy

    Long Time RKI Member

  • Regular Group
  • 3697 posts
  • Gender:Male
  • Location:State of Jefferson
  • Interests:Shooting, Hunting, Metal Detecting, Gun Trad'n

Posted 09 January 2004 - 11:14 PM

Funny you should ask check here----->


Firing pin gage(sic)

Is that a Brit proof mark on it?
  • 0

#6 Grumpy

Grumpy

    Long Time Member

  • Regular Group
  • 272 posts
  • Gender:Male
  • Location:New Jersey

Posted 10 January 2004 - 07:09 AM

OK, another dumb question. How do you use the gage?
Don't belive I've ever seen it in a manual or parts catalog.
Could be wrong, it's happened many times!

Bill
  • 0

#7 PK.

PK.

    Technical Expert

  • Board Benefactor
  • 1567 posts
  • Gender:Male
  • Location:CO, USA
  • Interests:Full time gunsmith who loves Thompsons, 35+ years experience.

Posted 10 January 2004 - 09:37 AM

I have not seen documentation on the use of the FP protrusion gage, but I am sure it exists.

In use, the bolt is removed form the firearm, the hammer is pressed flush against the front of the bolt as if the bolt were in the closed position in the receiver, the gage is then applied to the bolt face- the legs touching the bolt face and the protruding FP in the notch between the legs of the gage.

This points out some of the complexity of the system; while the FP can be of correct length, the hammer, hammer pin and bolt also play a part as well as the receiver and barrel. Every detail must be taken into account.

  • 0