I’ve had a couple of G rails- Mk1, Mk1 mod1 rev a, and a Mk4... the mk1 were cool because they were 10” and a rarity. However the mk4 is my favorite Geissele rail. I do love me some KAC though- the 3.1 is a solid rail and as far as the wrench goes- you can find them used on the EE’s in the...