Green mountain TC drop-in flash hole

[Eric Krewson]

I bought a Green Mountain drop in for my TC overhaul a year or so ago, I just got new eyes (cataract surgery) and can finally sight it in, today was the day.

I was getting inconsistent ignition; in 50 years of shooting percussion I have never had this problem. When I cleaned the gun, I think I found the problem, the flash hole wasn't drilled all the way under the nipple seat. Sorry for the big picture, if I resized it the flash hole would be in the dark and not show well.

I am pretty sure this is a manufacturing defect, you other guys with GM drop ins, how does the flash channel look in comparison?

 

[user 49093]

That looks exactly like the two Green Mountain drop-in barrels I have. They fire every shot! I've never had a problem with either barrel. They work flawlessly and are extremely accurate! Both are brand new barrels purchased within the last two years from TOTW.

 

[64Springer]

My '64 Zoli Zouave is drilled exactly the same way. If they drilled that pocket deeper, the flash would go past the flash hole. The way it's drilled, that pocket directs the flash into the flash hole.

 

[SDSmlf]

You can try shortening the nipple a little. I believe @Idaho Ron may have posted about this a few years ago.

 

[Eric Krewson]

On a TC they drill the flash hole all the way through forming the infamous clean out screw hole on one side and a plugged and barely visible hole on the other side, this arrangement seems odd. I would rather have the primer flash hit gunpowder than a blank wall with a small hole on one side.

I wasn't talking about the depth of the primer pocket but the cross drilled hole for the flash chamber connecting it to the breech.

I guess it is what it is.

 

[SDSmlf]

I wasn't talking about the depth of the primer pocket but the cross drilled hole for the flash chamber connecting it to the breech.

As I remember it, there was an ignition problem caused by that ‘flash’ you are seeing where the cross hole and nipple hole connect with longer threaded nipples.

 

[deerstalkert]

one thing you could do Eric. install the nipple and mark the side towards the flash hole. remove the nipple and grind a bevel to the flash hole in the nipple. that would direct the fire towards the charge better. jm2cents.

 

[TDM]

one thing you could do Eric. install the nipple and mark the side towards the flash hole. remove the nipple and grind a bevel to the flash hole in the nipple. that would direct the fire towards the charge better. jm2cents.

I like that.

 

[oldwood]

A pointed Dremel tool stone would fix that problem in a minute.

 

[TDM]

A pointed Dremel tool stone would fix that problem in a minute.

I like that too.

 

[hanshi]

I agree that the problem is likely the nipple fit and is, for a better word, "jammed". Deerstalkert makes a good case.

 

[tgfrench]

I like that too.

Or mess up the nipple threads in one fell swoop.

 

[TDM]

Takes a steady hand. Only for the fearless to attempt.

 

[Eric Krewson]

As a former power duck decoy carver, I know my way around a Dremel, I am going to notch the flat metal under the nipple like I have done to a breech plug when I got the vent liner just a little too far back. I have the diamond bits to do the job, they cut slowly and precisely.