Caliber is irrelevant to 922(v). But, it is relevant to 922(w). It is legal to make Hi-Capacity .22 Tubular Magazines for Civie Use. I.E. You can still make Rifles with Tubes that contain more than 10 Rounds of Ammo.
Now, the Magazine is important for several reasons:
1) A Gun that a magazine over 5 Rounds does not exist for cannot be an AW. But, should anyone ever make a mag. over 5 Rounds for it you are in trouble. Sort of like DDs. Since Japaneese Knee Mortar Ammo. existed, they are DDs even though the ammo. no longer exists at all.
2) Any gun with a fixed magazine cannot be an AW.
3) There is a contradiction in the Shotgun Section. The provisions of the Chapter say that any gun which cannot take a Det. Mag. of 5 Rounds or more is not an AW. But, one of the evil features on a Shotgun is a fixed mag. capacity. So, does the evil feature trump the exception ? No it doesn't. Exception trumps evil feature. A Detachable Magazine regardless of Capcity is an evil feature on a shotgun. Yet, w/o a 5+ Round Magazine existing or having existed it cannot be an AW.
Now, in order to try the 5 Round issue you would need to practically make your own mags.
This can be done. If I can do it, I would like to take an AR-15 0% Forging and make a rifle that will only take specially deisgned Single Stack Mags. This way, it will look and feel like the real thing, but as long as none of those mags. is over 5 Rounds it could have all the evil features you want.