Yes, I believe they're repairable. It might cost a pretty penny, I don't know. You'll have to contact Altsmoke for details, of course.
If you're looking for a true all mechanical mod that is definitely repairable in all areas that might ever need repairing, take a look at the new Roller mod by Atmizoo. It has a button on top side of tube, a battery cap, yet it is telescopic. (18350-18650 ). Here's a teaser video:
They're at http://www.atmizoo.com/ and come with a lifetime warranty on all metal parts, 2 year warranty on all other parts. (inside the button, for instance). I mention this one to you, because the button is 10x sweeter than even the Silver Bullets. yeh, it's NICE. I just got mine yesterday, but I'm totally in love. They update for free parts that ever need upgrading for performance wise. A real nice mod, and a real nice company. A new upgrade will be released real soon, they're working overtime testing the results of their latest improvements. (top cap now fits flush with genesis mods too, and a few other things that the first purchasers discovered could/should be different. This company LISTENS!).
Precise + is always a good mod too. Can't go wrong with one of these. They hit strong (pop a coil now and then even!), and last a lifetime. SuperTmanufacturing Great warranty.
Caravela has wow factor and works like a champ. Most beautiful mod.
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non-mechanical
Provari VV
Darwin VW
Zmax uses both VV and VW (new to the market, made in China, already a popular one. Igetcha69 has a review out if you're interested)