The various forums are filled which questions about upgrade barrels for the Takedown model. There aren’t many. Ruger listened. The new model 21133 Takedown has a 16.1″ .920 fluted bull barrel. The barrel is also threaded for your can. You can see the spec sheet here: Ruger Target Takedown.
The stock is the Design Contest Winner/Ruger American Rimfire design in the takedown version, with interchangeable buttstock inserts to customize length of pull and comb height. The stock has studs for your sling swivels.
MSRP is a hefty $629, which is $220 above the MSRP of a standard Takedown carbine, and $79 higher than a fixed, 20″ Target model (which has a laminated stock).
Considering that most of the few aftermarket barrels offered cost around $300, Ruger has wisely brought in a solution well below the cost of upgrading. The target barrel is excellent for accuracy, having a slightly tighter chamber than the carbines and sporters and great stiffness. With the barrel’s short short length and bull profile heft, this should be a handy, well-balanced little rifle.