If the bolt didn't budge, and you can easily move it using the charging handle, then I can say with pretty good confidence that both A) the gas feed has an issue (bolt doesn't move), and B) the extractor isn't installed correctly (otherwise when you manually pull the charging handle, it would eject the spent casing).
Since you didn't build it, GET IT BACK TO WHO DID BUILD IT! You may have to pay for a new stock, since that is due to 'user intervention', and possibly a new bolt (depending on what 'tool' was used to free its motion...).
Send it back, make sure they test fire it before returning it to you. Ask for a proof target.
When you do get it back, before trying to fire it, put a loaded mag in, operate the charging handle, then, WITHOUT FIRING, operate the charging handle again. You should get a nice fresh shell out of the rifle. If not, send it back again. If the first test works, and you fire it, and it doesn't eject, drop the live mag, and send it directly back to who built it, leave EMPTY casing in chamber. The builder will be able to better figure out the problem that way.
I still recommend you to find/view an animation of how the AR functions, as well as a blow-up diagram for the overall concept/construction. You will be tinkering with this alot for fun [read "enhancements"], you will also save much on gunsmith fees.
If you can't find the animations and assembly diagrams from Google, email me and I will get you some links.
Good luck, let me know how it works out!