"Yes, there should be. There are two (or sometimes three) holes jest behind the ejection port that are countersunk on the inside and would be perfect for mounting a deflector. I have no idea why they are there and the few times I have asked around, nobody seemed to know."
Answer, They serve as a case deflector. The bolt ejects the round and it spins 180 degrees backwards and the case mouth bounces off that area. The holes help deflect…. After you shoot you'll notice brass residue all around those holes … from casings bouncing off.
I got this answer from Aaron over at Beltfeds.Com Hope it answers your question. Bunker Bob!