Still fairly new to the whole posting thing, so forgive me and feel free to move if this is in the wrong forum. I found the determination letter online from the ATF that states if you want to add a buffer tube to a non-ar rifle, you can do so to an "ak-type" rifle/pistol. What falls under "ak-type?" I have it in my mind to do complete an 80% 10/22 receiver, pistol barrel and a modified stock with a buffer tube attached to facilitate a sig brace. Can I add a buffer tube to a 10/22 stock?

Thanks in advance