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Author Topic: Purpose of the slit on a B78's falling block....?  (Read 800 times)

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Offline BrnoB78

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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.
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Offline BrnoB78

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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 !
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Offline Smokin Joe

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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.
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Offline PeterF.

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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.
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