Gauging Interest in Tungsten Slow Fire Bolts

GunsCarsPlanes

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Wishing yall luck on getting some new bolts to market. I have fully enjoyed my CFW-a bolt I got from Tom. Between the CFW bolt and Lage's offerings I feel like I have 4-5 machineguns in one.

What rate of fire is that? Incase I ever get the option to buy another lage upper, seems like they offer several rates of fire and whatever rate you just shot seems perfect, not too fast and not overly slow.
 

Slowmo

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I made contact. Sam and I talked about it. Sam's got a lot of projects going.
If I remember right, political pressure was cited as one of the reasons that the previous machine shop was no longer interested in taking on the project. Obviously a lot has changed politically. Maybe a good time to call that machine shop up again.
 

Galil#1

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? Don't the heavy W beat the shit out of the receiver? 2-3-4 lbs of mass like a jackhammer affect? So ya beef up springs too? I'm M10 interested only.
 

SecondAmend

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No. They don’t beat up the receiver...
I have a M11-380 with reinforced front pin holes and an "A" tungsten bolt, and I'm not willing to go on record as saying that I consider that the W bolt is "receiver safe". I don't believe that the rear plate welds are in immediate danger, but I am concerned about possible front pin hole egging. The W bolt is double the weight of what the bolt that gun was designed to use weighs.

MHO, YMMV, etc.
 

JackBlundell

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? Don't the heavy W beat the shit out of the receiver? 2-3-4 lbs of mass like a jackhammer affect? So ya beef up springs too? I'm M10 interested only.
The Lage slowfire uppers for the M10 and M11 have been in use for well over a decade. They use large steel bolts of roughly twice the mass as the OEM bolt. I don't recall reading reports of egging issues coming from the use of these uppers.
 

Fishman

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I have a M11-380 with reinforced front pin holes and an "A" tungsten bolt, and I'm not willing to go on record as saying that I consider that the W bolt is "receiver safe". I don't believe that the rear plate welds are in immediate danger, but I am concerned about possible front pin hole egging. The W bolt is double the weight of what the bolt that gun was designed to use weighs.

MHO, YMMV, etc.
Double the weight, but impacting slower. Kinetic energy is a function of velocity squared, so decreasing the bolt velocity a little decreases bolt energy a lot.

Even if you do egg out the holes, it's a very simple sheet metal repair job. Not nearly as big of a deal as egging out an M16 lower.
 

Slowmo

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Double the weight, but impacting slower. Kinetic energy is a function of velocity squared, so decreasing the bolt velocity a little decreases bolt energy a lot.

Even if you do egg out the holes, it's a very simple sheet metal repair job. Not nearly as big of a deal as egging out an M16 lower.
That’s also why you frequently have to cut coils off the spring. Less rearward bolt kinetic energy, less compression of the spring. Which also means the bolt is being launched forward with less kinetic energy because there is less energy stored in the cut spring with the bolt locked back.
 

SecondAmend

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Double the weight, but impacting slower. Kinetic energy is a function of velocity squared, so decreasing the bolt velocity a little decreases bolt energy a lot.

Even if you do egg out the holes, it's a very simple sheet metal repair job. Not nearly as big of a deal as egging out an M16 lower.
With all due respect, what you are describing is so-called large body Newtonian physics and while it might be generally accurate at a macro level such as perception of the recoil of the total firearm, the hole egging occurs at a molecular level. Think of it this way, a blacksmith swings a heavy sledge hammer slowly to form a horseshoe, he doesn't swing a tack hammer rapidly.

As for the repairing, I don't know what the cost of the repair plus refinish would be, but the cost and inconvenience of shipping any machinegun have both become somewhat more than what they were ten years ago when I bought the M11-380.

MHO, YMMV, etc.
 

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