MRT73 Gendarmerie internal parts

A

Anibal

New member
I hope somebody can help me with some information.

I was watching in a internet site the internal parts of a revolver Manurhin MR73 Gendarmerie, looks a little like a S&W revolver without a hammer block, but there is some part that I don´t understand. I sending a image with this part marked in red. What is this part?

Thanks in advance and forgive my bad English
 

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Wow. thats tough. I wish I had one so I could play with it and see how it moves.

I see there are no bosses on the side plate, is it perhaps a fitted spacer to keep the hammer and trigger return slide in place?

And, your english is better than whatever other language I try and muddle through....
 
I've read that the M73 double action can be adjusted for pull, from heavy to very light without affecting the power of the hammer fall to ignite the primers.

I suspect that's what the square mechanism is. It seems connected to the trigger and hammer.

Mike, take a look at the exploded view again. The indexing hand is separate from the square mechanism with the spring-like finger sticking up. Look at part 137 besides part 159.

The indexing hand is attacked to the trigger similar to a Smith while what I'll call the "doohickey" rides on the trigger return assembly. Nice how in the exploded view they show the "bearings" to smooth up the trigger return assembly.
 
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Looks to me like it's attached to 2 flat springs - one to the rear and one that rides up under the hammer nose, so it's likely a combination trigger return (rear) spring & hammer block.
 
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OK, it appears to be the hand spring...

The literal translation is "lever spring from the barrel."


OK, I just downloaded the picture and blew it up to about 400%. It appears that the leaf spring is bearing directly on the rear of the hand, which is attached to the trigger.
 
The sport version of the MR 73 doesn´t have this square part. Only the gendarmerie version has it.

Look:
 

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You are right on the spring I think, but, for just a spring holder, that part sure looks like overkill. It looks like its flush inside the frame with a square bottom and attached the the hammer stud at the top. It doesn't look to pivot or slide.

I'm still leaning towards holding parts in, the inside of the sideplate, around that area, looks awfully empty. No slots, no bosses nothing.
 
Mike is right, it is the hand spring. (The French translates as "spring of the lever of the cylinder".) The two diagrams show two different types, one that the OP is asking about, which is a flat spring (the part with the slot serves only to keep the spring in position), the other shows a wire "mousetrap" spring which seems to fit into a slot in the hand. I have no idea which is the newer or if they are just two different models. I would think the wire spring would be less expensive and easier to make and install.

The wheels on the rebound slide are, IMHO, wild overkill. Simply grooving the S&W slide will reduce friction to near zero without wheels. Using the wheels forced them to go to a flat spring for trigger return, a more difficult system to make and work on and one that S&W got away from a century ago.

(The S&W hand spring fits inside the trigger; apparently they chose not to copy that system.)

Jim
 
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Barrel as in an oil barrel, not the actual barre the bullet travelsl. Of course...

French and German revolvers trend to be quite a bit of overkill post WWII.
 
I remember that the awful Colt All America 2000 had little wheels in the trigger mechanism. A silly and expensive failure there, too.

If a user thinks an S&W rebound slide is causing too much friction, cutting a shallow groove down the middle of the bottom and both sides is a lot better way to cut friction and is a lot less complex.

Jim
 
Mike is right, it is the hand spring. (The French translates as "spring of the lever of the cylinder".) The two diagrams show two different types, one that the OP is asking about, which is a flat spring (the part with the slot serves only to keep the spring in position), the other shows a wire "mousetrap" spring which seems to fit into a slot in the hand. I have no idea which is the newer or if they are just two different models. I would think the wire spring would be less expensive and easier to make and install.
Click to expand...
The leaf hand spring is the later production variant, made to be more resistant to cylinder hand bounce in very fast double action shooting.
The wheels on the rebound slide are, IMHO, wild overkill. Simply grooving the S&W slide will reduce friction to near zero without wheels. Using the wheels forced them to go to a flat spring for trigger return, a more difficult system to make and work on and one that S&W got away from a century ago.
Click to expand...
The leaf rebound spring was chosen for the capacities to set its preload with an externally accessible set screw and to incorporate a fifth roller for a variable mechanical advantage resulting in a trigger pull far more linear than that of a S&W.
 
OK, I see the trigger return adjustment screw (#120). I am not sure it is worth the extra expense, but it is a refinement.

Jim
 
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