I was wondering if someone could tell me who made my barrel and trigger group on my SA inc M1A. The trigger group is marked7267030-I. My barrel is marked SA 7790190 5 62 HD 41B under the hand guard. From what I've seen on other posts I know my op rod is a SA inc and my bolt's a forged SA inc. I was just wondering about these other two. The ser.# is 152XXX range. Thanks.