« previous next »
Pages: [1]   Go Down

Author Topic: Purpose of the slit on a B78's falling block....?  (Read 799 times)

0 Members and 1 Guest are viewing this topic.

Offline BrnoB78

  • Trade Count: (0)
  • Member
  • *
  • Posts: 37
Purpose of the slit on a B78's falling block....?
« on: September 15, 2008, 08:28:00 PM »
Could someone please clarify the purpose or function of the thin quarter inch long horizontal slit which is just visible on the upper left side of the B78's falling block ? I’ve never disassembled the action of mine so I don’t have a practical explanation - possibly a gas vent for a faulty cartridge!? Cheers,Ross.
Logged

Offline BrnoB78

  • Trade Count: (0)
  • Member
  • *
  • Posts: 37
Re: Purpose of the slit on a B78's falling block....?
« Reply #1 on: September 18, 2008, 01:28:09 AM »
Nearly 70 views and nobody knows the purpose of this rather mysterious slit in the actual falling block mechanism - as clearly observed when in it's in the upper most position (lever fully closed). I'm simply curious by nature, hence my reason for asking !
Logged

Offline Smokin Joe

  • Trade Count: (6)
  • Senior Member
  • *****
  • Posts: 1230
Re: Purpose of the slit on a B78's falling block....?
« Reply #2 on: September 18, 2008, 04:43:44 AM »
Don't know about your 78, but the one's I've seen on other makes were for gas relief.
Logged
Deo duce, ferro comitante
With God as my leader and my sword as my companion

Offline PeterF.

  • Trade Count: (0)
  • Avid Poster
  • **
  • Posts: 230
Re: Purpose of the slit on a B78's falling block....?
« Reply #3 on: September 26, 2008, 12:06:53 PM »
According to the exploded parts diagram (see the Service Manual), it looks like that's where the Firing Pin Bushing Pin goes.  Why it's a slot, rather than just a hole, I can't tell, except to provide a port for pressure relief (as suggested elsewhere). Just my guess.
Hope this helps.
Logged
Pages: [1]   Go Up
« previous next »