Taking the cz 457 Trigger to 2 lb

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Merlin
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Re: Taking the cz 457 Trigger to 2 lb

Post by Merlin »

Pete - The trigger pin with the clip is a great idea. I've had mine in and out 5 or 6 times and it is clearly a Lot looser now...... Is that a stock pin/part or a custom piece?
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pdeal
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Re: Taking the cz 457 Trigger to 2 lb

Post by pdeal »

I made the pin. If you want one pm me your address I will send you one.
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Merlin
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Re: Taking the cz 457 Trigger to 2 lb

Post by Merlin »

pdeal wrote: Tue Apr 21, 2020 8:02 am I made the pin. If you want one pm me your address I will send you one.
Pete that is splendid! An idea that is worth commercializing IMO.

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tomon
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Re: Taking the cz 457 Trigger to 2 lb

Post by tomon »

I'd buy a couple of the pins! Yesterday I ordered the kit from YoDave, BEFORE I read this! I'll also polish all surfaces (judiciously) with my Demel and Jewelers rouge. I don't think my MTR will adjust down to 2lb. I was going to redo the adjustments, but decided to go the new Spring route.
K Danz
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Re: Taking the cz 457 Trigger to 2 lb

Post by K Danz »

Got the parts yesterday. Thank you very much!!
I started with the medium spring and got it down to 18 OZ.
I put in the lightest spring and got it to 10 OZ, but testing it by working the bolt quickly and closing it smartly resulted in the sear releasing.
Took it back up to 14 OZ and no problems whatsoever,
Now I could put a tiny bit of sear engagement back into it, but it feels really good right where it is.
Gonna try it with some live ammo this week.
Awesome upgrade!!!
:D

Thanks again.
You really should sell these as kits. You could make some money on this for any CZ 457
tomon
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Re: Taking the cz 457 Trigger to 2 lb

Post by tomon »

I got my set yesterday in the mail. I'll put the rifle back together sometime over the weekend. Thank you, Sir! While waiting for the kit, I took the Bolt apart and filed the Firing Pin so that it will miss the edge of the rim. The firing pin now should be more consistent for each hit. I also checked the Head Space using the Plastigage method, as I don't own a depth gauge. I pulled the bullet from a cartridge, dumped the powder, and put the round in the chamber after measuring the Rim thickness. Closing the bolt with the Red Plastigage between does a controlled smash between the face of the bolt, and the back of the cartridge. The Rim thickness measured about .0395. The width of the Red string when compared to the chart on the package looks to be about .0065. This equates to a Headspace of .046. As I had ordered stainless washers awhile back from MC, I had the options of .001", .002", .003", or any combination thereof. The 3/8x 5/8 washer fits perfect for the 457. I installed one .003 one for the initial try. SK/Lapua has .043 rims, the RWS has .041, and the Eley is at .039. You can measure other brands and adjust accordingly.
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Re: Taking the cz 457 Trigger to 2 lb

Post by tomon »

Well, it's 12:30am and I just came up from finishing the 457MTR. The Pivot Pin is quite slick. I used the lightest spring and took it down to 12oz and stopped there. It passed the Bump test with no hiccups. The only maybe negative is that I had to take out some wood for the longer Pull Weight screw to clear. I didn't want it to ride on the wood even If the pillars held it stiff and still! The little wood removed doesn't affect anything though. I will shoot it at this weight for awhile and then might lighten it more.. I checked the Barrel Grub screws at 30 in.lbs., and the Stock Screws I set at 25 in.lbs. each. It's now ready to go BANG! Many thanks again to Pdeal for his generosity! I'll report again after shooting it. However, Mother Nature is frowning upon that for the next week!
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