Rocky Mountain Instinct A50 27.5" size XS.  This bike rides great!  Mechanically excellent.  My son grew out of it so it's up for sale.  

It has a new Shimano XT rear brake lever, Fox 36 fork, Fox Float DPX2 rear shock, alloy frame, Wolf Tooth dropper lever, Race Face dropper seat post, Shimano SLX front brake, Shimano SLX shifters, Shimano XT rear derailleur, WTB rims with DT Swiss hubs, Maxxis DHR II rear tire, and Maxxis DHF front tire, and a WTB saddle.

Feel free to reach out with any questions.

Thanks!

Chris