Measurements: 18.6 cm
Weight: heavier than RSVP MX
CoP: About the R in RSVP on the barrel
Cost: Between 3-5$, i stole the pen from Wal-Mart(sad, isn't it?) and i got the G-Force from the floor

Materials:
Two RSVPs
BiC Velocity 0.9mm pencil
Papermate G-Force 0.5mm

1. Remove grip from RSVP place it in cap
2. Remove grip from Velocity, slide it onto RSVP (the one with the unused grip) does not have to go fully in.
3. Remove Tip from G-Force; slide it into the velocity grip tightly

It is unbalanced a little as it shifts toward the metal tip.

P.S. Sorry for no pictures, i don't have camera

Edit:
for an insert how cool would it be to put Glow-In-The-Dark Stickers into the pen and spin while theres a movie going on in class? Don't care if it annoys people i usually sit in the back anyways

Pentel R.S.V.P. BK91 USA, usually the same compared to a BK90 (for me, dont notice the difference).

I suppose this is a BIC Velocity Ballpoint 0.9mm pencil you are talking about.

And this must be the Papermate G-force 0.5mm.

what do u think this pen needs?

So if I understood properly it's the same as a MX just that you put a grip over the front grip and use a different tip. Really there is no need for names for pens like these ones, then for each MX with a different grip there should be a new name. Just call it, my personal RSVP mod or my "Fake" RSVP MX.