TC Renagade barrles

[BrownBear]

thank Jim but no everything the way it should be the nippel was tight andthe threds are gone down too the last two
thank you Jim

Can't say that all the threads were engaged when the nipple was seated down, but two left and the rest gone REALLY makes me wonder if the nipple hadn't backed out a couple of turns before the mishap.

One thing for sure. All of us can speculate, but I bet only TC can diagnose it. Time to get on the phone and box that gun up.

 

[bingo1952]

Both of you are correct it was indeed a M6 that I was attempting to say. :bow:

 

[Mad Professor]

I suspect you meant a 6x0.75 metric thread; the 6mm MD is just 0.014" undersize for a 1/4" MD hole. The 0.75mm pitch is 33.9 tpi, however, and that seems unlikely to mesh with a 28 tpi hole beyond about a half turn.

I guess one could force a full turn and maybe even more with a wrench as you suggest, but it would take a lot of torque. I can't imagine it being accidental. It would certainly destroy the threads and greatly weaken the integrity of the nipple installation, making it susceptible to being blown out.

Edit: Zonie beat me to it, while I was typing. I don't think the loose MD clearance would be enough to make the 34/28 tpi interference not noticeable, but in any case I agree with him and runnball that this is the most likely reason for the incident.

Thats just what GM did with a whole lot of IBS barrels.