I had a black one some time ago and far from being the rumoured power-house - I do recall being very disappointed with my velocities...
I re-sprung and resealed mine - but the improvement was marginal, I cannot remember the exact velocity now, but they were advertised here as being 500fps in .177, but from memory I think mine struggled to hit 400fps.
The 'silencer' was just straight through and ultimately I felt disappointed with mine so it went...even though it was one of those guns I really wanted when I was younger.
I'd be interested to know if mine was untypical of the model...