Your mod has a delta ring, for free float the delta ring has to be changed to a barrel nut along with a free float rail. A BN wrench is needed for this, don't know how it will attach to your gun.
This is why i said it could be a costly upgrade!
SR7 notice the difference between the MOD2 delta ring & the SR7 barrel nut
SR7 free float & barrel nut
Edited by tales, 04 August 2014 - 12:49 PM.