6x6.8 spc gas length

[Fair chase]

Looking to build a 22” 6x6.8 spc.
Trying to decide between R or R+2 gas . My gut is telling me R+2 will run smoother, but it’s gonna stick out of my 15” handguard.
Whatdo you think ?

 

[Constructor]

It will barely stick out. The back of a rifle length is 12 3/8. +2 is 14 3/8. 1" long GB =15 3/8".
You could go +1 to keep it completely concealed.