I have had a horrible experience with a C93 (Century built 223 HK33) and it took a new barrel, front sight post (they welded it on) and to get the welds redone, plus a refinish to get it to fire right. I couldnt return it to Century because of the bullet button being installed for california which in Century's opinion voided the warranty.
I would contact Century right away, and send this back to them as it should be under warranty (if you are the original buyer) and get this rifle repaired by them. By what I have heard they dont really repair them, but just send you another one that does function most of the time.
Also (be sitting down reading this) Century warranties only last one year from the date of manufacture, not sale. So if your shop had it sitting in the back for 11 months and sold it to you, then you only have 1 month left to be able to inact a warranty claim! Are you kidding?
Sorry man, but after that I will not buy anything made by century anymore. If its a bulgarian makarov and they only put an importer mark on it thats one thing, but I dont care if its an M1a for $500 dollars...I wont be buying it. They ground my barrel on a belt sander to be able to tap it in with a hammer. Removing the barrel pin would allow me to rotate the barrel in the trunnion. Bolt gap was at 0.01 (supposed to be around 0.13-0.15 for function). My old barrel could not be reused because of the ovalized hole for the barrel pin. It looked great, but either wouldnt cycle or would rip up the brass. I ended up sending mine to a shop that works only on HK products, and after a lot of calls and laughs they fixed it for me and function tested it with 120 rounds just to prove it, and I have been happy ever since. Ha ha, I forgot that they even corrected the shape of my receiver to get it more true to shape.
My century C93 cost me:
Rifle $599.00
Dros $25.00
Tax $58.40
New Barrel $150.00
New Front Sight $35.00
Installation, headspace, welds, small parts $200.00
Refinish in HK Gloss black $100
Total $1167.40
Good luck with yours, I feel for you.