LOL! I'm not sure of anything...how can I tell?
Which way the rifle goes at the squeeze of the trigger. If it dips immediately, it's the comp, if there's a slight delay, it's the weight of the bolt carrier.
Ahh...that explains it. It moves immediately downard, then hesitates for a very short moment, then wiggles/dips slightly lower again. I guess the first movement is the comp and the second is when the bolt comes back forward. I shot it before the comp and it rose, but from what I remember, it rose less than what it currently drops.
Thanks!