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Shooting & Reloading - Mausers, Big Bores and others >> Rifles
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Gibbs505
.333 member


Reged: 09/08/03
Posts: 442
Loc: BC, Canada
Problem with a #4 mk2 ***photos added***
      #37929 - 21/09/05 02:35 PM

I was shooting a #4 mk 2 at the range recentlt when I ran across a problem. When I pulled the trigger, the pin would fall but the cocking piece would only fall part way and I would have to pull it back. This only happened twice in 10 shots berofre I had to leave.

It was like the sear was catching in the locking recesses!

Anyone got anyidea on this?


--------------------
So I can't spell, so what?

Those who beat their swords into ploughshares, will plough for those who don't!

Those who fail to learn from history will be doomed to repeat it

Edited by Gibbs505 (27/09/05 02:08 PM)

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Marrakai
.416 member


Reged: 09/01/03
Posts: 3612
Loc: Darwin, Top End of Australia
Re: Problem with a #4 mk2 [Re: Gibbs505]
      #37948 - 22/09/05 12:00 AM

Yes. it was almost certainly the sear catching the half-cock. This shows that you have excellent trigger control, Gibbs505, and that the 2-stage trigger has been ground down to a single-stage pull. This is not an unreasonable modification to perform on the smelly, but can have that annoying side-effect.

If the trigger is still 2-stage, you may have a more serious problem. Either way, replacing the cocking-piece is a simple job which will almost certainly fix the trigger.

--------------------
Marrakai
When the bull drops, the bullshit stops!
--------------------------------
www.marrakai-adventure.com.au

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Gibbs505
.333 member


Reged: 09/08/03
Posts: 442
Loc: BC, Canada
Re: Problem with a #4 mk2 [Re: Marrakai]
      #38055 - 24/09/05 03:01 PM

I have checked out the bolt. The bolt handle is numbered to the receiver. It has a #2 head which I unscrewed and eximained. The fireing pin I cannot remove as I do not have the correct tool, but it appears to be ok. There was oil but no cosmoline and the bolt head appeared to be clean.
All other screws are tight!
I have not had the opptuneity to go back to the range again, but hope to this weekend.
If it happens again I will have to have the rifle checked again I guess! :?

--------------------
So I can't spell, so what?

Those who beat their swords into ploughshares, will plough for those who don't!

Those who fail to learn from history will be doomed to repeat it

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Marrakai
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Reged: 09/01/03
Posts: 3612
Loc: Darwin, Top End of Australia
Re: Problem with a #4 mk2 [Re: Gibbs505]
      #38126 - 25/09/05 12:02 PM

Gibbs505:
Here's a pictorial explanation of the cocking-piece/sear-engagement modification which is the likely cause of your problem:



The cocking-piece on the left shows the normal unmodified sear-engagement. You can see the shiny 'bruise' on the front face caused by the trigger-sear at rest when the rifle is cocked (1). Note that it is some distance above the lower edge of the face, which allows for the 2-stage pull common to many military rifles including the SMLE.

The cocking-piece on the right has been ground off below the sear-engagement to eliminate the 2-stage pull. It has effectively eliminated the second stage, so that the beginning of the first stage pull will now discharge the rifle. Note that the 'bruise' (2) is now immediately above the lower edge of the face, so that any movement of the sear will drop the cocking-piece and fire the rifle.

I'm betting that your rifle has been modified to remove the second-stage of the trigger-pull (as in 2). This is really only a problem if you want the rifle to remain original ie as a collector's piece. In that case, you should try to acquire a replacement cocking-piece which has not been modified.

Now, if you wish to eliminate the problem of catching the sear, you need only grind a small bevel on the lower lip of the half-cock notch and all will be well! This can be done with an ordinary grindstone without removing the cocking-piece from the bolt, but its easier to clean up afterwards if you strip the cocking-piece from the bolt first. In that case, you would need a firing-pin removal tool of some kind. I made my own.

Here is how to grind the bevel:



Here is a pic of a successfully-modified cocking-piece, showing the reduced sear engagement to remove the second-stage (1), and the small bevel which eliminates the sear catching at half-cock (2).



Hope this helps solve your problem, Gibbs505.



--------------------
Marrakai
When the bull drops, the bullshit stops!
--------------------------------
www.marrakai-adventure.com.au

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Gibbs505
.333 member


Reged: 09/08/03
Posts: 442
Loc: BC, Canada
Re: Problem with a #4 mk2 [Re: Marrakai]
      #38268 - 27/09/05 02:08 PM

Thanks Marrakai, I have now stripped the rifle and here are some photos!

First the cocking piece, which has not been modified as fa as I can see


Next, the top of the sear

Last the trigger group.

I was not able to get out this weekend, Maybe next after I reassemble the rifle!

--------------------
So I can't spell, so what?

Those who beat their swords into ploughshares, will plough for those who don't!

Those who fail to learn from history will be doomed to repeat it

Edited by Gibbs505 (28/09/05 09:50 AM)

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Marrakai
.416 member


Reged: 09/01/03
Posts: 3612
Loc: Darwin, Top End of Australia
Re: Problem with a #4 mk2 [Re: Gibbs505]
      #38362 - 28/09/05 09:50 PM

Hmmm, curious. Looks like the half-cock notch has already been beveled.

You've got a lot of gunk on those internals though, Gibbs505, maybe a good clean-up will solve the problem. Perhaps the trigger is not dropping freely away after the sear breaks. At least with the Mk 2 you can dry-fire it while disassembled, so why not try to duplicate the problem before replacing the forewood. I will be most interested to hear your findings.

--------------------
Marrakai
When the bull drops, the bullshit stops!
--------------------------------
www.marrakai-adventure.com.au

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Gibbs505
.333 member


Reged: 09/08/03
Posts: 442
Loc: BC, Canada
Re: Problem with a #4 mk2 [Re: Marrakai]
      #38545 - 02/10/05 06:09 AM

Just got back from the range. The rifle shots great now, no malfunction's and the best group was about 1.5" -4 shots- with a 5th taking it out to about 3".

Thanks for all the suggestions folks, it seems athr a good clean was what it needed!

--------------------
So I can't spell, so what?

Those who beat their swords into ploughshares, will plough for those who don't!

Those who fail to learn from history will be doomed to repeat it

Post Extras: Print Post   Remind Me!   Notify Moderator  
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