Not at all. If you used a credit card for the transaction, you can always pursue a dispute with the credit card issuing bank. FYI: Amex is a little more customer-friendly than Master Card or Visa, but you DO have dispute options through all of them.
If not, you can always sue them in Small Claims Court for the cost of correcting the mistake.
Getting a second opinion from another gunsmith that the sights were improperly installed (along with an estimate on the cost to fix) would help your case immeasurably. Make sure you note the time and dates when you attempted to get Diamondback to cure the problems (along with what they told you.)
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