CZ 457 MTR

[AirGunShawn]

I just installed my YoDave trigger spring for my CZ 457 MTR..... The factory trigger was turned down to 15 oz. The new spring brought it down to 9 oz.
The CZ has a nicely shaped trigger blade and the trigger feels more like 6 oz. That is much more to my liking. The trigger pin is press fit into the trigger blade and is difficult to get out. To put it back in, I actually took a couple thousandths off it's diameter as I was not willing to risk damaging the housing.

I then used some fingernail polish to retain the pin in place. I could have staked it but, I may have it out several times to lap the sear surfaces.
I highly recommend you make the pin a slip fit in the trigger blade. It is so tight that it bent my brass pin punch and was starting to bend my steel punch.
It is scary tight. I bounced the gun on the butt a few times and the trigger did not go off.

Also.... I am pleased to say that the Harrell tuner does make a difference. All it takes is .125" adjustments to see a significant change.

 

[Frankr]

Nic. Can’t wait to see how it shoots.

 

[AirGunShawn]

I just got the tuner on 4/15 and don't even know what ammo my 457 likes yet. I was skeptical that the tuner would do much on the heavy, short bull barrel. To mount the scope, I pulled the action and clamped the magazine well in a vice and supported the muzzle.
Before anybody GASPES... lol.... My vice is a small flat jawed machine vice and was really only used to keep the action vertical. Then I used a Wheeler level system to dial in the scope. It was the best way for this particular rifle. It spead up the entire process and minimized the amount of levels involved. I hate to say this but the level on the Area 419 rail is nearly useless while shooting. It is totally obscured by my scope. It is however useful for scope mounting. Below is my RPRR trigger that I lapped off. I don't think I will need to do anything more to the CZ 457. Just adjust and replace the trigger spring.