with a car, your dealer IS you manufacturers direct representative.
Of course you are welcome to return a defective gun product to the person you bought it from for rectification. the thing is, is that RA probably has the exact same thing to send back to you, and the odds that it is the thing you just returned are high.
If you go directly to the manufacturer, many will just send you a new part of the most current type without requiring you to return it, OR will send a call tag for it to be shipped back.
It's always a good idea to go to the manufacturer directly and explain what the problem is. In the firearms industry you will find that many companies are small and run by the owner directly who is probably the guy answering the phones or making the product himself. They will be able to address your problem to the highest level of satisfaction, where a dealer may only be able to send you out another example of the same product.
THATS WHY WE TOLD YOU TO GO TO THE MANUFACTURER DIRECTLY. 8)