Author Topic: Installing hard sear.  (Read 5034 times)

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BRASMAN

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Installing hard sear.
« on: November 30, 2005, 06:33:42 AM »
How hard is it to install the hard sear in a 97B and what special tools would you need?

Walt-Sherrill

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Installing hard sear.
« Reply #1 on: November 30, 2005, 06:40:14 AM »
Ask that of Jim Miossi, directly.  He sells the parts and is very helpful with this sort of question.

Offline Miossi Gun Works

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Installing hard sear.
« Reply #2 on: December 01, 2005, 12:06:01 AM »
The Miossi Gun Works Custom Hard Sear is oversized in all dimensions.  First you need to file down the top so that it will clear the slide, next is to fit the sear into the ear cage which is usually a drop in fit, next you need to remove a small amount of metal from the safety tab so that it allows the sear to pivot enough to clear the hammer hooks, just maintain the same angle of the tab.  Then you need to remove metal from the trigger bar tab and time it to reset simultaneously with the FPB lever, this is where you can change the timing of the gun for the better. You will also have to shorten the trigger bar connector tab and angle it slightly.  Lastly you need to fit the sear to the safety and not the other way around.  I say that as it is safer doing it that way as the safety has a lot less metal to work with, and incase you want to remove the sear and install it is a new gun and put the old OEM sear back it will function just as before.

The first time around it may take 3 hours or so depending on how well you understand the CZ action and how it all works.  It takes me about one hour to fit the sear properly as their is a lot of reassembly and testing and then disassembly and fitting.

Jim

Miossi Gun Works LLC
702 Park Dr
Monticello, IA 52310

BRASMAN

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Installing hard sear.
« Reply #3 on: December 01, 2005, 04:45:24 AM »
Thanks. I wish you you did refinishing work also.

n-65x55mm

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Installing hard sear.
« Reply #4 on: December 05, 2005, 01:40:16 PM »
Jim,

What is advantage of hard sear vs. standard sear?

(I am relatively new to this forum, so excuse the dumb question)

Thanks

J.

Offline Miossi Gun Works

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Installing hard sear.
« Reply #5 on: December 05, 2005, 05:18:50 PM »
The reason for a hard sear like ours which is rated at 55C on the Rockwell scale is an important item in a custom gun.  The hard metal will hold its honed edge for the life of the gun regardless of the number of rounds fired.  The OEM sear is in the area of 30C on the Rockwell scale and is much too soft for a fire control part, the softer steel will peen into a different shape the  more it is shot.  This is why the SA trigger improves over time with the OEM sear, it is peened from hammer battering and the nose of the sear becomes a flatter surface.  If you look at any of the many high quality parts for the 1911A1 you will find they are all between 45C and 60C, this includes the sear, hammer and disconnector, they are all machined from a solid block of hammer forged steel.  Cast and MIM parts do not belong in the fire control components even if they have been hardened because their hardness varies with the depth and type of steel used.

Our company is working with another to produce a hard hammer for the CZ75 series.  This will take us to a whole new level of what we can offer to the shooter.  When we perform an action job for a customer with one of our hard sears we can tune the action to a much more precise standard and the trigger will not change over time or wear out.  When we use an OEM sear we need to leave extra metal to allow the battering from the hammer,  thus the sear is going to change its shape in the most critical area and this affects the feel and break weight of the tuned gun.  This also requires a mechanical break in period that only live firing will do.  Thus we can not guarantee that 2.5lbs trigger will remain at 2.5lbs as the gun is used.  However with our hard sear we can guarantee that the trigger will break at the customers specified break weight from day one and on.

Guns require different types of steel for different parts, the frame and slide are relatively soft, this is because they need to absorb recoil from firing, if they were made of hard steel they would be very brittle and crack when fired.  The barrel is also a mild steel as it needs to flex and take the shock and pressure of firing a cartridge.  But the fire control parts need to stand up to constant battering with out being prone to preening or changes to the shape of the surface areas. The hammer has more metal on and behind its critical contact area with the sear and this is the reason that the soft hammer will hold up to this battering much longer.  The angle that the sear nose is cut and honed to has to match the hammer hooks angle, but the amount of sear contact is much less then the hammer so it is the most prone fire control component to battering and preening.

I hope this helps explain the reason for a hard bar stock sear.

Jim

Miossi Gun Works LLC
702 Park Dr
Monticello, IA 52310

wanderlust005

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Installing hard sear.
« Reply #6 on: December 06, 2005, 12:57:28 AM »
Thanks Jim,

This is quite a useful information especially for those of us new in this hobby.

I say this forum is quite informative over all, has been a lot of help to me, a beginner in this field and hobby.

Offline Miossi Gun Works

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Installing hard sear.
« Reply #7 on: December 06, 2005, 01:43:06 AM »
Glad I could help, especially a beginner.  You will find the CZ forum the friendliest and most informative overall compared to the other gun forums on the web.  Visit GlockTalk and you will read members slamming other members for having a differing point of view and a lot of bad advice being given out by people who should not be giving any advice at all.  

This is a friendly forum where all views are welcome without any hostilities and we all learn from other members regardless of our being a beginner or an old timer with a lot of hard learned experience.

Jim

Miossi Gun Works LLC
702 Park Dr
Monticello, IA 52310

wanderlust005

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Installing hard sear.
« Reply #8 on: December 07, 2005, 10:43:57 PM »
Coincidentally, i discovered the glock forum 1st, before i even had the inkling that a cz forum do exist, and that was while i was still researching about the 1911a1 and before i 1st meet my baby... my 97B. but i refrained from becoming a member as, and as you have mentioned jim, the forum seems hostile specially to newbies/new comers.

im no stranger to community forums myself, as at present i am a member of 4 other community forums(in one i am the admin, and a mod in the other) all related to audio (my other hobby).

I am glad i choose to be a member here, and like many, this is my very first time becoming a member of a gun dedicated forum.

Thank you all for the warm welcome, more so to Walt, Jim, Otto, czattorney, and to all other new acquaintances that i have failed to mention. :D

Offline Miossi Gun Works

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Installing hard sear.
« Reply #9 on: December 08, 2005, 03:37:00 PM »
wanderlust005 we are glad you have joined and are here.  I think you will be a regular reader and contributor to the forum.  If you like it enough over time consider becoming a supporter.

Welcome aboard.

Jim

Miossi Gun Works LLC
702 Park Dr
Monticello, IA 52310

IamSonnyD

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Installing hard sear.
« Reply #10 on: December 08, 2005, 04:21:29 PM »
You are definitely right about GT.....I've been a member there for over 4 years and it's sometimes crazy over there.  It's almost Blasphemy if you even mention liking something else beside Glock, even in Other then Glock forum.  I was chastised so much over there when I even mentioned the XD.  But there are some good open minded people over there, but most just worship at the house of Gaston.

  I've only found a few forums as friendly as this one.

  Regards Sonny

wanderlust005

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Installing hard sear.
« Reply #11 on: December 08, 2005, 09:17:30 PM »
Funny, i was actually directed first to the other than glock forum :rolleyes  lucky me the topic wasnt of much interest to me (a norinco) :)

Yes i will consider it in the near future, but how do you become an ez supporter, if i may?

Offline Miossi Gun Works

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Installing hard sear.
« Reply #12 on: December 08, 2005, 09:34:02 PM »
To become a supporter go to your account settings and I believe their is an option there.
Moderators please correct me if I am wrong and give the proper directions.

Jim

Miossi Gun Works LLC
702 Park Dr
Monticello, IA 52310

Walt-Sherrill

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Installing hard sear.
« Reply #13 on: December 08, 2005, 09:41:28 PM »
If you're feeling generous and want to help the CZ Forum, make your contribution to the CZ Forum rather than EZ board.

You can make a direct contribution to the CZ Forum at the bottom of the main page.  (You'll find the current balance of funds and a place to click, where you can use PayPal or a debit card to make a direct contribution.)

EZ Board support helps YOU, but doesn't help the CZ Forum.  (EZ board support gives you, as a user, extra privileges on any of the many EZ board community forums.  If the CZ Forum is your main EZ Board participation, you don't gain a lot with EZ Board privileges.)

Direct support to the CZ Forum helps us keep the pop-up ads away.

Offline Miossi Gun Works

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Installing hard sear.
« Reply #14 on: December 08, 2005, 10:05:43 PM »
That was easy, thanks for the directions to the direct contributions to CZ Forum Walt.

Jim

Miossi Gun Works LLC
702 Park Dr
Monticello, IA 52310