Hey guys, I have a thompson center black diamond and my breach plug is stuck in the barrel, I have tried a few things and it has not moved. any ideas on how to get it out or should i just take it to a gun****h?

My son forgot to clean his rifle after the season and left it uncleaned for nearly one year when he wasyoungand his was stuck. I took the stock off and the scope and bought a can of brake claner and soaked it in that. It came out and I cleaned the bore also with the brake cleaner, since there was rust and fouling in the bore. it cleaned up fine.
Chap Gleason

If you have some Kroll Oil or WD-40 pour that or spray that down the barrel and one outside of the breech plug. Then get a 7/16th or is it a 9/16th long socket with a 8"long extension rod. Put the barrel in a vice, locking it in place with the locking lug. Be sure to put some leather or something around the lug when you put that in the vice to avoid damage to it. With the ratchet and long extension you can reach in there past the hammer striker and that will lock on to the 209 nipple. Take that out first before you attempt to get the breech plug. Again spray that outside good with WD-40, Kroll Oil, or some penetrating oil. Then with the ratchet start to put pressure on it and it will normally turn out.

If that does not work take the barrel and put it in boiling water (the breech plug end) or you can pour it down the barrel. After the breech plug is very hot, have a bowl filled with ice and water. Now dip that breech plug into that ice water to cool it rapidly. Get it into the vice like described above and that will often times break the breech plug loose.

In the future, use a good breech plug grease. After 10 shots on the range, turn that breech plug back and fourth to make sure it is not seizing. You don't have to take it out, just twist it.

Well I have never stuck an inline myself, but I have fixed a number of stuck ones. I use PB Blaster as a sort of cleaning and lubing combo after it soaks for 24 hours I pour the break cleaner to it and let it soak another 24 hours if it is still wont break loose I put the air wrench on it so far they have all come free. The old hawkens that someone wants a barrel changed on can be the most difficult. Lee

How long has it been stuck???? If just recent, soak it in really hot water. When the barrel is too hot to touch you should be able to back it out then.

It got stuck last season, but I used it to hunt with anyway. I forgot that it was stuck until a few days ago.

the biggest problem with a stuck breechplug is [1] screwed in too tight [i finger tighten mine and never have a problem removing it ] [2] use anti-seize grease on the threaded part of ur breechplug ..and take the time to clean it when u r finished hunting or shooting on the range ..

Call Thompson Center. Tell them the problem. I will be they would have you mail it to them and they would unstick it, and check the rifle over. Call them... it would be worth it.

You can always try the freezer trick, take the barrel off, put it in the freezer. next day have boiling hot water ready with barrel in vice pour hot water on and put the wrench to it

My breech plug removal tool (knight wolverine) has a hole in the end of it a little smaller than the diameter of a pencil. If/when mine gets stuck, I will WD40 or rem oil it as suggested above thenget one of the small, L-shaped allen wrenches, put the short end in the hole and tap/pound/bang on the longer end of the allen wrench. It will usually come out with a little "motivation". Let us know what you decide to use and how it works. Good luck, Greg