Yes, you can use this gas block with the TRYBE Defense 16 in Government Profile AR-15 Carbine Barrel (TRB-ATB-WGOVAR-BARCARBT16223).
Ken, the TRYBE Defense AR-15 .750 Mil-Spec Gas Block is 1.030" long, with set screw hole being 0.295" from each end. Distance from center to center of the screw holes is 0.440"
It should be compatible
Roll pins are normally offered with the gas tube and are often not included with the gas block.
Yes it is compatible
The spacing is .450".
Yes, it should be compatible.