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Sean-- I don't know if instructions are included, but would guess they are. I would suggest getting on You Tube and finding a 'how to' video for changing the barrel. There are many. It isn't too complicated, really, but one needs the right tools, including a torque wrench. 300 BO can use the same magazine as .223/5.56. There is no changing of the bolt or mag well - they are the same for 223/5.56 and 300 BO./ For the 7.62X39, one will need to change barrels, bolts, and use the mag well insert - and the 7.62X39 does use a different mag (the more 'curved' one). Honestly, the 300 BO and 7.62 X 39 are very, very close, ballistics wise. Not sure I'd go for this kit, really. Easier to buy a 223/5.56, and just a 300 BO barrel, or just a 300 BO complete upper, where changing out would be a matter of seconds, no tools required. . Cheaper, too, and one gets about the same performance with 300 as with 7.62X39, and less ammo to buy too, Hope this helps and if you go for it, have fun!

Sean, it comes with the manual and you can also download it online. This revolutionary upper is designed to allow you to switch between barrels with great ease. Typically this task would have been impossible if not for the brilliant engineers in the Windham Weaponry R&D department. If you have been considering dabbling in other AR-15 calibers pick up one of these Windham MCS kits and see how easy the transition can be. The AR15 .223/.300 Mil-Spec Magazine is cross compatible between the two.