Ar gas block??

[james2133]

i want to throw some larue parts at the ar 15 and was wondering if anyone could help with what size gas block i need for a rock river with the wilson r-4 16" barrel... the choices are 3/4 and 5/8... any help would be great

 

[ants]

From the picture and description on the RRA site, the R-4 profile on the Wilson barrel appears to be a common commercial version of the milspec M4 profile. That would take a standard 0.750 gas block or sight tower.

 

[james2133]

thanks that is what i was thinking but wanted to make sure prior to ordering