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Click no Bang - no wimpy fire control

This is a discussion on Click no Bang - no wimpy fire control within the Rifles forums, part of the Rifle & Shotgun Forum category; I have a Kimber 84M that has always been wimpy on launch time - making it go bang. The very first time I took the ...


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Old December 11th, 2016, 09:33 PM   #1
 
Join Date: Feb 2013
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Click no Bang - wimpy fire control

I have a Kimber 84M that has always been wimpy on launch time - making it go bang. The very first time I took the 84M out it failed to fire on occasion. Stripping the bolt cleaning out the insides with toothbrush and pipe cleaners did not work. Adjusting the ammo headspace to zippo helped somewhat but was no sure fix. I did not want to go to primer selection because except for minor differences in primer height I am of the belief that they are of equal hardness but sensitivity might be an issue so I skipped the CCI #34's - at that time.

This rifle has a sort of peculiar design that I don't especially like. To make the pin strike with increasing force, tension has to be added and this is done by hauling back on the pin using a screw driver on the pin that goes through a threaded cocking piece and this decreases pin protrusion..

Increasing pin protrusion decreases spring tension.

I try to get .045 - .050 protrusion and this removed lots of tension on the spring. No bang - just click.

The solution appeared to be maintaining the firing pin protrusion while increasing spring tension. This was done by inserting a small washer that was turned down to fit inside the back shoulder of the bolt shroud. The washer was threaded through a machine bolt held in position by a nut and spun by my cordless while holding a file to the spinning washer.

The attached photo shows this,

Another photo shows the pin protrusion,

The thickness of the washer is .038.

The difference is noticeable CLICK or BANG instead of a wimpy click.

I would prefer my FN Mauser rifles over the Kimber when in less than happy shooting days like fair weather. The Kimber will always be a fair weather rifle.
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Last edited by BassMan; December 12th, 2016 at 09:49 AM.
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Old December 22nd, 2016, 07:31 AM   #2
 
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It works - last trip to range, about 80 rounds fired and all went off.

Still a "fair weather rifle" the people who designed it were small obsessed and it is difficult to load rounds into the minimum size and length magazine so they easily feed well, especially in cold weather using gloves.

I see newer Kimber rifles appear to have the same threaded firing pin and cocking piece. Hopefully they have a longer spring that will allow correct pin protrusion and enough spring compression/tension to enable the rifle to fire.

I am sorry I re-barreled it in .308 W, .22-250 loaded to COAL of 2.65 or so would be a much better fit.
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