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Gunsmithing Dpms gasblock set screw spacing

Rlandry

Gunny Sergeant
Full Member
Minuteman
Feb 16, 2019
856
907
Anyone know the center to center spacing they use on the GB for the Sweet sixteen? I want to replace it with a low profile one and different hand guard. The current one is a two screw, .875", and a picattiny rail on top.
It's difficult to measure with calipers but it seems to be something less than .400. I can use a GB with just one set screw but I would like to be able to add a dimple for the second setscrew so the spacing will have to be fairly large.