Stretch that drill bit

[Frank S]

This thread started out as a method to extend common drill bits. Now it seems to have morphed into a couple of other discussions, which I have no problems with as far as it has gone so far. As long as everyone plays well with others
I have not commented on the rifling button Idea because I feel that anyone attempting to make a button is first going to have to create a very special tool grinding fixture as well as have a very high precision grinder and the skill set to create these buttons.
in general rifling buttons don't actually do much in the way of cutting the groves in the barrel as much as they do more to finish the bore to a smoother rifled state after the groves have been cut. Using the button alone to rifle a barrel method works better in the shorter barrels of handguns.
And that is as far as I am going to hijack my own thread. Feel free to submit a link to your own thread for the discussion of rifling a .22 barrel I will add this though When contemplating the making of a barrel for a fire arm first start off with good high quality ,materials if starting out with tubular steel be sure it is seamless and can withstand the explosive pressures of the discharge to what ever cartage or shell to be used. If this barrel is going to be a sleeved bore or a multi layered barrel then each successively smaller tube must fit tight to the previous bore the larger tube must be honed to as near perfection as possible while the tube to be inserted needs to be polished to as near to mirror as possible then frozen in dry ice or bathed in liquid nitrogen if possible to reduce the diameter enough to be pressed into the outer tube. after all tubes are assembled the final bore needs to be honed to precisely the correct diameter that the chart says the pre-rifling bore is for what ever caliber the barrel will be.
You may find that you will need to extend the length of the reamer or hone in much the same way as I did my simple drill bit extension or it may be better to thread an extension to the tool. Gunsmithing is not something you just wake up on Friday morning and decide you are going to build a fire arm over the weekend. it takes a lot of research and many special made tools to construct even the simplest of firearms if they are going to be safe and be accurate