Hi Mike, welcome aboard! Your BC carbine is working normal, if you were to change the latch engagement so it engaged the entire latch shelf, the barrel would be loose with any wear, you can see proper latch engagement in the FAQs and Help sticky barrel fitting info. I wouldn't recommend you make any changes to the barrel as long as it's working fine, if there's a problem, H&R will fix it properly for you. their CS is second to none when it comes to repairing their products.
Tim