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Old May 03, 2019, 19:36   #1
bond 007
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converting a 16" JLD back to G3K

Gunplumber,
Did you have to remove the triple tree? I'm not sure if my receiver will fit into the throat of my lathe. I have given thought to cutting it by hand. I have done this with an AR barrel and used an 11 degree hand lapping crowning tool and clover compound. How did you cut your barrels?
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Old May 04, 2019, 17:38   #2
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Has anyone done this here.
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Old May 04, 2019, 19:13   #3
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I have a fixture for spinning the receiver and barrel together. Basically a ro through to to a dead center for the chamber, with a double "L" piece that pins the receiver to the rod through the stock holes.

Use the front pin only and clearance for MP5 ejection ports.

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Old May 05, 2019, 14:23   #4
bond 007
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Ingenious tool Mark. I have spent many hours trying to figure this out, without having to use a saw and piloted annual cutter.
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Old May 05, 2019, 14:27   #5
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FWIW, tool is aluminum, but has a replaceable brass center for the chamber.

just keep rpms low.
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Old May 08, 2019, 18:43   #6
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Quote:
Originally Posted by gunplumber View Post
I have a fixture for spinning the receiver and barrel together. Basically a ro through to to a dead center for the chamber, with a double "L" piece that pins the receiver to the rod through the stock holes.

Use the front pin only and clearance for MP5 ejection ports.

Beautiful tool.
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Old June 06, 2019, 18:28   #7
bond 007
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converting a 16" JLD back to G3K

Mark,
Sorry for the delay as I had to go to work and deal with stress and feed the family. I started on my tool and had to have my local machine shop finish it for me before leaving. I picked it up Monday and they did a fantastic job, using your photo.
While still trying to figure out how to post photos here I am scared to death to cut my JLD rifle barrel. I have had so much trouble with obtaining a functional G3K in the past. I have bought 2 PTR K3P pistols only to have them fail to function reliably after several hundred rounds of different ammo, and several different locking pieces.
I purchased my JLD back in 2010 or 11 on gunbroker and it is beautiful and functions perfect. I can not find a makers mark on the barrel anywhere though. The serial number is A35XX. The bolt and carrier is marked HK 5/71 with no markings on the locking piece. I have several different locking pieces from #3 to #18 in German and US/RCM. The cutting, crowning and threading is the easy part to me, What worries me is my gun not functioning reliably after the chop.
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Old June 07, 2019, 08:18   #8
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Did you have a question?

It's not gas operated. Doesn't care what the barrel length is.

Yes, the G3k has a different locking piece than the G3, but I've never used one. The G3 locking piece worked fine at 12.8" full auto.
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