RRages has been OOO for a while and I've seen a few on auctions sell.

Is there still an airsoft made B+T style folding stock for sale? Classic Army lists one but no luck heating back from them.

Or should I just get a factory sliding stick while I can?

I picked up a classic army version last year - fit perfect.  No other ones I have tried and I've been looking.  The S&B brace fits into the classic army end cap perfect so you can make a pistol brace version.

The retractables look nice but are not durable and flimsy-ish  The GSG side-folder that resembles MP5K side folder is decent and strong.  Can still find those on ebay and other places new.

Thank you!

Well the search is still on. There is ONE left on fleabay for more than $100.