I ordered a TDI  M/16/AR15 butt, I dont believe it comes with the tube, spring, buffer. ( I didnt ask but read it did not on another forum).
I have seen a few shotguns with the CAR/M4 type stocks. I plan on putting this one on my saiga12. I have the ar/15 -ak adapter.
Need recomendations on good collapsable buffer tube assembly and where to get it.
Thanks

You could order a tube for $13 from eagle firearms.net its a 6 posistion.The whole assembly is $70.If not when you get the tube you can buy a stock from can arms they are like $40 but for the price of the 2 parts your better off spending the extra $15 bucks and get the whole thing.That leaves you with spares or you could sell them off.Keep in mind the colt stock and tube is the milspec correct stock as its tube is slightly smaller diameter but at $130 to $175 for just needing it for the shotgun Id stick to RRA.I have RRA asemblies on my Bushy carbines and I love em.If you get a tube from Bushmaster they are $25 + shipping and its the 4 posistion one thats shorter than the new type 2 tubes although the shorter one is still the standard.I like the slightly longer angled ones that match the type 2s or waffle stock.