I bought a 54 caliber smooth bore Green Mountain drop-in barrel directly from Green Mountain. When I put it in my Thompson Center Hawken stock the hammer did not line up with the nipple. The front of the hammer hit right in the middle of the nipple. I took the rifle to a gunsmith to have the hammer bent. He said the problem was that the hole where the nipple went into the breechplug had a heli-core crookedly inserted into it, and thus the nipple was coming out of the breechplug at the wrong angle. A heli-core is a liner used to rethread a hole for one reason or another. Why did the original nipple hole have to be rethreaded? I wrote Green Mountain a letter, and emailed them, but I have not heard back. I am very disappointed. I have three other drop-in barrels, and none of them have a heli-core to insert the nipple into.
My other drop-in barrels lined up correctly with the hammers with no adjustment needed. I was wondering if the barrel is a second, or maybe just reworked at the factory. Anyway, the bottom line is that I have a rifle I can't shoot, and don't know what to do. Any suggestions? Thanks.
My other drop-in barrels lined up correctly with the hammers with no adjustment needed. I was wondering if the barrel is a second, or maybe just reworked at the factory. Anyway, the bottom line is that I have a rifle I can't shoot, and don't know what to do. Any suggestions? Thanks.