Send it in, it shouldn't keyhole with 50gr factory ammo, it may with heavier bullets tho, mine shoots 50gr handloads under an inch at 100yds, you might call again and insist on sending back to the factory, the only reason it might take a long time is if they need to replace the barrel and they don't have any in stock, most repairs take less than a month for in stock repair items, two members just got their accessory barrels back in about 1 month from when they sent them in, repairs have priority over accessory barrels.
Tim