Various Google searches turned up:
RockShox XC28, Tektro Novela disc brakes.
Had to filter out a lot of Zed 4.4 and 4.6 results.
From here: http://www.bikeforums.net/mountain-biking/772415-new-rig-entry-level-29er-review.html
Frame 6061 Aluminum 29" Wheel Mountain Hardtail, Custom Blend Tubing Crankset Funn Thrilla, White
Rear Shock N/A Bottom Bracket VP - BC73, Sealed Cartridge
Fork SR Suntour, XCT-V3, 100mm, White Pedals Wellgo Alloy
Headset VP - Threadless 1-1/8" Rims Alloy Double Wall 32 Hole
Stem Alloy: XSM-SML = EXT:90mm / MED-XLG = EXT:105mm, 10Deg Front Hub Alloy Disc QR
Handlebars Alloy Mid-Riser Rear Hubs Alloy Cassette Disc QR
Grips Black MTB Spokes 14G Steel, Black
Front Brakes Tektro Novella Mechanical Disc 160mm Rotor White Tires WTB Nano, 29"X2.1"
Rear Brake Tektro Novella Mechanical Disc 160mm Rotor White Seat Post Alloy 27.2mmX 300mm
Brake Levers Tektro 2 Finger Saddle WTB Valcon Comp w/ Custom K2 Logo
Front Derailleur SunRace Top Swing Seat Binder Alloy QR
Rear Derailleur Sram X.3 Colors Blue, Red
Shift Lever Sram X.4 Trigger Sizes SML, MED, LRG
Cassette / Freewheel Shimano CS-HG30, 12-32T, 8 Speed Extras Refectors & Owners Manual
Chain KMC Z-72
I'm wondering if the 4.9 was a special build done just for Academy and perhaps a couple other retailers.
Some close up shots of a 4.9 in this video: http://www.youtube.com/watch?v=lkJV3_lM0wA
Overall, it's a mix of decent, but not anything more than solid entry level components, pieces parts. Replacing a failed or trashed part with some other brand of part would not make an owner cry or cause him to go crazoid trying to match up an OEM piece.
As you can see, Rock Shox and some shimaNO parts were substituted in some build variations...the bike is built to a price point, not a quality level or spec sheet. You are going to find a lot of no-name Chinese/Taiwanese/Korean parts on any bike in the $200-$750 price range and the K2 line is no exception.
Almost all bikes in this price range will require tuning, adjusting, attention to maintenance and careful torquing of the lower grade fasteners found on them. There's still plenty of fun riding and learning of mechanical skills to be gained from them.