The new tube arrived yesterday. It is a 9.6" titanium tube that has internal threading on both ends identical to a mag-lite. So most of my other parts are compatible. With the end cap and thread adapter installed OAL is right at 10"... which is good because that's what I put on my Form 1
Here are all the thread adapters I have now. I won't know for certain until I use them all with the new tube, but initially I like the Preppers Discount adapters better than SD Tactical because they have more thread engagement with the muzzle. (right to left: SD Tactical Low Profile Aluminum .30, Preppers Discount .30 recessed, Preppers Discount .22 standard)
And to make all the new equipment worth it, I'll be loading some of these bad boys to be subsonic!