This bolt that came out of my SIG is like the Titan bolts I made. It is very close to the KAC E3 which was made for the 5.56, I designed mine a little differently for the .441 case head.
Titan is the middle bolt, Super bolts in 6.8 I machined is 2nd from left, 750XD and 800 series 4th and 5th...