[Stealth]

The nub in the Modify kit is a bit undersized laterally and unless you center it correct across the arm, you'll get curved shots.
The sleeve also isn't universally that good, for the reasons stated above.

An R-hop installation only requires you to remove and disassemble your barrel group once. Where did you hear that you had to take it apart multiple times?

Lastly, even an R-hop with a standard round nub will blow a flat-hop setup out of the water. And that's fact.