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Machinist for a Custom GBBR Bolt

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Old June 28th, 2012, 18:02   #1
Rommen
 
Join Date: Jul 2011
Location: Mississauga, Ontario.
Machinist for a Custom GBBR Bolt

First to the mods, I'm sorry if this is in the wrong section. I really wasn't sure where to post it, move it if necessary : )

My KJ M4 suffered it's first catastropic failure after 20,000+ rounds. A part of the bolt carrier that runs under the nozzle has snapped cleanly off, rendering the gun non-functional. Now the simple solution is buy a new one, right? Well there are 2 versions and V1, which I had, is discontinued. Unfortunately the V2 performs worse than the V1, so I'd like to keep the same design. I've stripped the bolt down and have some pics, it doesn't look overly complicated to machine another, given you have the right tools. A new bolt machined from solid aluminum is what I am thinking.

If anyone is or knows a machinist capable of doing this job, please contact me. I will reimburse you for time and material. Pics below







This picture clearly shows where the tab has broken off the main bolt carrier unit. Notice the light gray area on the bottom, below the circle.


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Old July 10th, 2012, 19:06   #2
Rommen
 
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So no one is or knows a good, well equipped machinist? Anyone?
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Old July 10th, 2012, 19:43   #3
Kokanee
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There is a great fellow in Winnipeg who does custom work, but I cannot remember his handle here on ASC...which sucks as I have a job for him!
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Old July 10th, 2012, 22:19   #4
Dynamo
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unfortunately some of the features of that carrier can only be made by casting the part.
overall the main body of the carrier isn't overly complicated and could be machined, the issue would be that circular feature in pic#4(cylinder shame with 4 square notches around it). that feature can only be cast. i'm assuming that the 4 notches are there for the piston/cup to seat in. not having these notches may cause problems.
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Last edited by Dynamo; July 10th, 2012 at 22:21..
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Old July 20th, 2012, 09:02   #5
SuperHog
 
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I doubt everyone here knows a machinist personally.

You are in Mississauga. Lots of CNC shops in your neck of the city. Just look it up in the Yellow Pages.

If the V2 part is working but worse, can it be modified by the machinist so it can have V1 specs?

Last edited by SuperHog; July 20th, 2012 at 09:05..
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