|
Your hop rubber shouldn't factor in with your fps. If you get an inferior hop rubber that requires more pressure to achieve the same hop, it will reduce your fps, but also your performance.
More likely, it's possible the modify rubber is just crap, or the 6.01 barrel is just too tight for the ammo you're using.
Anyway most stock GBBR inner barrels are fine, it's just the hop rubber that needs upgrading. People always overestimate the advantage a high quality barrel has over an already good barrel.
Try using the stock barrel with a better hop rubber
|