Cannot see weapon?

Goto UDK Installation folder \Engine\config\BaseEngine.ini

Down at the very bottom is the Oculus setings, and stereo 3d settings.
Change bHideGun=True to bHideGun=False.

That did it for me, however the gun (default UTGame gun) Is crazy long in the rift, and looks like its mounted to your face.
Below are all the settings related to the Rift in the UDK baseEngine.ini Playwith at your own risk, as im not a UDK expert, and have no idea what might happen.
I wonder what the HudDepth does.. HMMMM.

[Engine.Stereo3D]
bEnabled=False
EyeDistance=0.062600
HudDepth=3000
bOverrideFov=False
CrosshairOffset=1280
bVisibilityTestBothViews=True
bOverrideRecenter=False
bOverride2D=False
FrustumOffset=0.000000
MovieWidth=400
MovieDepth=100

[Engine.Oculus]
bEnableHud=True
bDisableControllerPitch=True
bHideGun=True
bDisableDeathAnims=True
EyePosInHead=(X=12.600000,Y=0.000000,Z=7.000000)
bDisableMomentum=True
bUseDotCrosshair=True
CrosshairAlpha=64
CrosshairSize=6
CrosshairMinDistance=180
YawMult=1.000000
AccelGain=0.050000
MotionPrediction=0.020
MotionPredictionMode=2
bDisableWalkBob=False
bUpdateOnRT=True
MouseAimLimit=5461
MouseAimPitchLimit=3641
MouseAimMode=OMA_Normal

The same settings can be found in \ UDKGame\Config\UDKEngine.ini, I'm guessing you should change those settings instead of BaseEngine.ini. Also for the love of god don't turn on death animations, scared the hell out of me.

Thank you guys very much for the responses!!

honestly, it's an easy fix if the gun placement and size is weird ^_^