For those interested in a folding stock for their 10/22 Takedown, I just got my AGP stock and installed it. I have the 10/22 Takedown "Tactical" with the threaded barrel and came with a "flash suppressor" (yeah, I know).
Since we're in Michigan, I was worried about the folded length. It's right at 26" to the shortest point behind the receiver when folded. If you measure to the farthest point on the pistol grip (which I think is the correct way), it is more like 27". It would be too short without the flash suppressor. The flash suppressor is not permanently affixed (screws on), but as I recall a permanently affixed cage is only necessary to measure the barrel length, not the overall length in Michigan.
Overall, it's a nice stock. There is some gap between the front/back stock portions, where the barrel connects. I also got the 1" butt pad from AGP, but it's still a bit shorter than the original stock. If you have the Ruger Takedown bag the stock portion will still fit in the pocket (unfolded, with scope) with a little wiggling, but the pistol grip makes it tight. The tall UTG Bugbuster scope I have on it makes it tough, but it goes in.
Pics below: