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Old 05-26-2019, 11:28 PM
tothemax

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Reshaping & polishing firing pin 457



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Sharing a few pics of the firing pin polishing and shaping I attempted on my 457… I will shoot it tomorrow and will compare results on target as well as sd readings on the chronograph.

Using a couple of small hand files & a vice, I reshaped the firing pin profile so as to not crush the rim and also take out the square angles I had there before. On the pic below the black magic marker is how I had it before with the square angles and touching the rim. The new profiles on top of the picture is after the reshaping.

Also as suggested by RickBaum, I lightly polished the sides and underside of the firing pin with 400 grid wet sandpaper followed by a light Dremel and rouge polishing.

Let’s see how it shoots tomorrow.










Last edited by tothemax; 05-26-2019 at 11:33 PM.
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Old 05-26-2019, 11:28 PM
tothemax

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Old 05-26-2019, 11:32 PM
Frank3

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Very nice photos. Looks like it works well.

Can you dry fire the 457?
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Old 05-26-2019, 11:38 PM
tothemax

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EDIT.

Pls see post 20 below for the dry firing question.

Last edited by tothemax; 06-02-2019 at 05:28 PM.
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Old 05-27-2019, 03:22 AM
Wyocaddis
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Nicely done and great photos
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Old 05-27-2019, 07:49 AM
fwood
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Very nicely done. Looking forward to seeing the changes in performance.
What was the performance issues you were having prior to working on the striker?

In my case, my 457 At-One was having issues with vertical stringing and would often imprint two separate groups. A low group and a second group about 3/4" higher. When I disassembled the bolt I found it very wet with light oil from the factory. I degreased the bolt and polished the striker but did not reshape the striker. Lightly relubricated and reassembled. The vertical stringing appears to have been resolved and the rifle is much more accurate and consistent in general. Group sizes have gone from 3/4" to 1 1/4" before to averaging.4-.5" after polishing. I've had about 70% of the after groups .4" and 10% .2- .3". Quite an improvement from where the rifle started.
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Old 05-27-2019, 10:43 AM
Tessitori

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After my first trip to the range with the 457 MYR I will know this modification will be necessary. Please keep us posted on the improvements you notice during your next range session.
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Old 05-27-2019, 11:39 AM
tothemax

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Quote:
Originally Posted by fwood View Post
What was the performance issues you were having prior to working on the striker?
Thank you.

With this 457 Varmint, I was having minor vertical stringing and some fliers. I did the shaping in two stages. First I got it down to square pattern with the black felt pen marks in the photos above. This was giving good results and eliminated the vertical stringing.

This time I polished the pin, rounded off the corners and moved the imprint a little further in from the edge of the rim.

Range opens in an hour and half. I hope the wind slows down some so I can quantify any improvements.
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Old 05-27-2019, 12:03 PM
CaptBill252

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Just thinking out loud.
Does CZ have new 457 firing pins for sale / available.??
Does anybody sell them already modified to the best profile.??
No prob with me doing it. Just asking.

I'm watching very closely to what you guys are doing. I've been reading about the fireing pin and stringers. My MTR needs some tweaking. Not as accurate as I would like.

Thanks everyone.

Bill H
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Old 05-27-2019, 03:04 PM
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Nice job TTM!

Any pics of imprints after you rounded off the upper corners?

BTW.. I highly reccommend a dry lube containing PTFE or Teflon for the striker and striker channel on these 457's. A wet lube is going to collect dust and potentially gum up the striker which could lead to ignition issues with the exposed strikers on these 457's.
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Old 05-29-2019, 01:59 AM
tothemax

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Thank you Rick, this shows both the patterns before (bottom) and after (top) reshaping.

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Old 05-29-2019, 06:09 AM
fourbore
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The subsequent posts clear up some confusion for me. There is no before photo. I already know how those look, but; others may not. I did get confused a bit why the before looked so good. The square strike marks are after and they look good and they shoot good. The round impression is simply a 2nd tweek. Proof will be in the shooting and at this level ammo choice could be more of a factor as well.

You know what would be interesting? To see strike marks on the magnum rimfires with an unmodified before and that same square 'after' pattern.

I also wonder if the after market will step up and provide a solution. Seems I read there was an option out there. Yes, I think there is and I asked if it was suitable for 22mag and no response was provided.
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Old 05-29-2019, 01:58 PM
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Quote:
Originally Posted by tothemax View Post
Thank you Rick, this shows both the patterns before (bottom) and after (top) reshaping.

Looking good TTM.. Nice work! The rounded imprints look just like my DJ tuned Anschutz imprints.


fourbore.. The only "aftermarket" strikers, modified or otherwise, were made by Bscar. Unfortunately, the last I heard, he isn't going to be mass producing them.

Last edited by RickBaum; 05-29-2019 at 02:01 PM.
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Old 05-29-2019, 11:53 PM
tothemax

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Quote:
Originally Posted by RickBaum View Post
Looking good TTM.. Nice work! The rounded imprints look just like my DJ tuned Anschutz imprints.


fourbore.. The only "aftermarket" strikers, modified or otherwise, were made by Bscar. Unfortunately, the last I heard, he isn't going to be mass producing them.
Also CZ is not selling any 457 firing pins ... or C clamps ... or other common spare parts for the 457 model ... Am trying to find out when they will have some in stock but so far was not able to find out. Very goofy IMHO .. Like VW or BMW coming out with a new car model but no spare parts available

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Old 06-02-2019, 11:22 AM
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Question for tothemax. - btw, nice pics. My question is - what is the procedure and/or techniques for disassembling the 457 bolt. I would like to clean, polish and dry lube my striker but am reluctant due to no available parts if I screw up. But if it’s a simple procedure I will attempt. Thks.
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