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Old 03-18-2017, 03:20 AM   #1
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Technical Documentation Alfa Project 3863 Sport

Hello!
I'm hoping someone can help me here....

I've exhausted the works of Mr Google in trying to find anything and I'm still waiting to hear back from the Czech head office, so I don't think I am being lazy here

I am looking for technical diagrams relating to the Alfa Project 3863 sport revolver in 38-special.

What I am looking for in particular is the length of the firing pin without dismantling the gun (thereby disabling it) so that I can compare it to other guns with frame-mounted firing pins - particularly S&W. I don't want to go to a gunsmith here as there aren't many of these around and I would prefer to work on it myself rather than pay someone else to learn.

The purpose of this is to enable me to lighten the trigger.

(I shall explain...)

The firing pin, as said earlier, is frame-mounted.
The hammer spring is coil-type similar to some S&W and Ruger (from what I've seen).
When you lighten the hammer spring, the pin still makes contact with the primers but is not enough to set it off (even with reloads using Federal primers). I am theorising that a fractionally longer firing pin will resolve this issue (and potentially lightening the firing pin spring).

I'm doing my homework here rather than charge in and potentially wreck a gun by not knowing anything before cutting springs, etc.

Thanks in advance to anyone who knows something or can share pictures or documents.
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Old 03-18-2017, 11:11 AM   #2
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Mate,
Lengthening the firing pin or lightening the firing pin spring will not lighten your trigger pull. In fact, either - both together especially - could create an unsafe condition.

I'll add that I think you are looking at the wrong end of the firing cycle for a remedy. After all, the firing pin spring's purpose is to prevent the firing pin hitting the primer (preventing an accidental discharge) until the hammer strikes it. The length of the firing pin serves much the same purpose. Also, there are number of other moving parts in a revolver (to rotate the cylinder) between the trigger and the hammer.

My first suggestion would be to look at the surfaces of the trigger the sear and all the moving parts in the firing cycles (double and single action) for friction areas and polish those surfaces without removing material.
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Old 03-18-2017, 04:01 PM   #3
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WADR, but if I read the OP correctly, he is trying to remedy light primer strikes, when he lightens his trigger pull. The OP has lightened the main spring, but is getting light primer strikes, and is wondering if lightening the firing pin spring, and/or lengthening the firing pin length will solve his problem.

You might get a small amount of help by lightening the firing pin return spring, but I would suggest that, if possible, get an assortment of mainsprings(different weights), and trial and error will tell you what weight of mainspring is the lightest wt. and still be 100% reliable.

I would not install a longer firing pin, if that length functions correctly with the factory mainspring. A longer firing pin could set you up for pierced primers, which is not a good thing to have.
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Old 03-18-2017, 04:33 PM   #4
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Thanks for the replies.
I was confused for a second there and thought that I has worded my question badly.... lightening the firing pin sping will certainly achieve nothing other than a floating firing pin - and that would be bad.

A firing pin piercing the primer is something I hadn't thought of and you (gt40doc) have my thanks again for mentioning that... I am thinking of a replacement firing pin that is only thousandsth of an inch longer but I can see your point.

The spring for the hammer in EOM is a strong one and trying to find a replacement that is near the same dimensions is hard. Any spring you buy in a gun shop here seems to cost a minimum of $10 and I know of one bloke who has spent a fortune going through various springs to try and find a solution. I achieved a great result - hammer-wise - using nested springs to obtain a good length and a good weight in the single-action phase of shooting the gun but that is where the light primer strikes occurred. Factory ammunition wouldn't go off at all and reloads were a 50-50 affair.

I mention the lightening of the firing pin spring on the basis of a discussion with someone at the club who had an issue years ago with what he said was a frame-mounted pin on an S&W revolver that was causing similar issues (I forgot which model he said). He was saying that once they lightened that spring that there were no more failures for any of the people who had that gun. Of course, I am talking to everybody and others who know inifinitely more than I have said that doing that is bad.
I've not heard anything said about pierced primers from anyone until now.

I am now wondering (as obtaining springs one at a time from a gunshop is ridiculously expensive) if anyone knows of another source of springs that I could use for testing of the mainspring? Model shops maybe?
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Old 03-18-2017, 05:59 PM   #5
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If you could get your hands on a selection of mainsprings that would fit in your revolver frame, even if for other brands of handguns, you could go from there. If you had a couple of OEM mainsprings, then you could experiment with cutting 1/2 to 1 coil at a time for trial and error. I fear that you are in for for some experimentation in order to reach your desired goals.

I am totally in the dark as to the revolver that you own. I have never seen or handled one, so I am speaking in generalities.

Installing a firing pin that is ONLY 0.001in. longer SHOULD pose no problem......longer then that, and installer beware. I wish that I could be more help.
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Old 03-18-2017, 08:29 PM   #6
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That's along the lines of what I (and the other bloke) have been doing. I didn't want to do anything to the OEM spring as I could render the gun useless until I found another.

What you say about the firing pin is how i was thinking.

It would have also made sense for me to post a pic :)

Here are a couple of pics (on Dropbox)
https://www.dropbox.com/s/awfmiadub5...%2003.jpg?dl=0
https://www.dropbox.com/s/e4vhk8uxdb...%2007.jpg?dl=0
https://www.dropbox.com/s/97zyoy34yl...%2004.jpg?dl=0
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Old 03-19-2017, 06:06 PM   #7
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That is a most handsome revolver!! If it shoots as good as it looks, then you have a "laser" shooter. Good luck with your trigger work, and thanx for the photos.
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Old 03-19-2017, 07:51 PM   #8
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Quote:
Originally Posted by gt40doc View Post
That is a most handsome revolver!! If it shoots as good as it looks, then you have a "laser" shooter. Good luck with your trigger work, and thanx for the photos.
Thanks :)

I bought it at the Shot Show when it was in Brisbane a couple of years ago. Because of the restrictions, I had to show my licence for concealable firearms and even then was not allowed to hold it without a trigger lock on place. I knew nothing about them and it appears that nobody else did either but I just loved the finish on it and the extra work on the sport-spec barrel.

Now to locate some springs and start the tests....
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