Porabilic motion of a projectory

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sswift

Chad:
I think you mean "Parabolic motion of a projectile". :-)

Octo:

No, no, no! Constant rotation will give you a circular arc and will yield highly unrealistic effects (especially if you shoot straight up!)

He's not telling him to...

...oh wait, he is.

WolRon:
You shouldn't use MoveEntity. You should use TranslateEntity.

First you translate your gun's normal into global space like so:
TFormNormal 0, 0, 1, Gun, 0

Then you multiply that normal by the speed of your projectile:

Bvx# = TFormedX() * BulletSpeed#
Bvy# = TFormedY() * BulletSpeed#
Bvz# = TFormedZ() * BulletSpeed#

Then each frame, you multiply 9.8 by the number of seconds that that frame took to render, (Secs#) and subtract the result from Bvy#.

Finally, you move the bullet with translateentity each frame, like so:

Translatentity Bullet, Bvx#*Secs#, Bvy#*Secs#, Bvz#*Secs#

Oh, and use AlignToVector Bullet, Bvx#, Bvy#, Bvz#, 3 to align the bullet's Z axis with the direction it is traveling in.