Killbox - take some pictures, throw them up, and point out your issue. You're stating you have a free-floating RIS but it's falling off if you take the gas block off, which isn't making much sense. The only thing I can think of at this time is that your RIS isn't properly mounted at the receiver side.
Pictures = 1000 words.
VFC SCAR-L - VFC SCAR SSR - KJW Hi-Capa 5.1 - CAW M79
The Three Sisters - WE G39 E/K/C
Originally Posted by kalnaren
Stalker stays where he is.
His BB's fly across the country to hit their target.