Hi guys,
Many of us buy raw barrel blanks from e.g. LW. We naturally want to have them threaded for a silencer, a muzzle break or simply an air stripper. The most fundamental fact is to center the blank in a lathe in relation to the bore rather than the outer surface. There are many techniques to do it which are beyond the scope of this topic. However, there is one extremely important aspect which was overlooked too many times by too many machinists. I experienced that with TJ barrels but it is not limited to them.
To make things short please just watch the video:
https://youtu.be/CUm_YXzJJOU
If your barrel is choked and you are unsure how the bore is going to react due to material removal then cut the threads so that they cover the whole choke length even if you don't need them to be so long. If the bore opens up then, in theory, it can open up evenly through out the entire choke. Still, the end of the bore will have smaller diameter than the rest of the bore, hence having a choke. If the choke is very light then the bore may open up too much for the choke to compensate.
Anyway, I avoid threading any barrel. If it has to be done then the least amount of material should be removed and the threading length should be the same as the length of the choke.
All of the above applies to the muzzle end only. When one makes the threading of the action end of the barrel then such a behavior might not have any negative influence on the rifle precision.
Looking at the FX system - their liners are not affected by that because there is no threading on the liner itself. Still, they are not perfectly consistent but it is not the subject of this topic.
Enjoy!
Many of us buy raw barrel blanks from e.g. LW. We naturally want to have them threaded for a silencer, a muzzle break or simply an air stripper. The most fundamental fact is to center the blank in a lathe in relation to the bore rather than the outer surface. There are many techniques to do it which are beyond the scope of this topic. However, there is one extremely important aspect which was overlooked too many times by too many machinists. I experienced that with TJ barrels but it is not limited to them.
To make things short please just watch the video:
https://youtu.be/CUm_YXzJJOU
If your barrel is choked and you are unsure how the bore is going to react due to material removal then cut the threads so that they cover the whole choke length even if you don't need them to be so long. If the bore opens up then, in theory, it can open up evenly through out the entire choke. Still, the end of the bore will have smaller diameter than the rest of the bore, hence having a choke. If the choke is very light then the bore may open up too much for the choke to compensate.
Anyway, I avoid threading any barrel. If it has to be done then the least amount of material should be removed and the threading length should be the same as the length of the choke.
All of the above applies to the muzzle end only. When one makes the threading of the action end of the barrel then such a behavior might not have any negative influence on the rifle precision.
Looking at the FX system - their liners are not affected by that because there is no threading on the liner itself. Still, they are not perfectly consistent but it is not the subject of this topic.
Enjoy!
