PSP, CWcheat and texture ripping help!

[Final light]

Try going strait for the UMD. If you press select at the XMB you should get a menu that looks like this:

CPU CLOCK XMB Default
CPU CLOCK GAME Default
USB DEVICE Memory Stick
UMD ISO MODE M33 Driver
XMB PLUGINS Enable
GAME PLUGINS Enable
POPS PLUGINS Enable
USB CHARGE Disable
HIDE MAC Enable
SKIP GAMEBOOT Enable
HIDE PIC Disable
FLASH PROTECT Enable
FAKE REGION Disabled
SHUTDOWN DEVICE
SUSPEND DEVICE
RESET DEVICE
RESET VSH
EXIT

Set USB device to UMD and hook it up to the computer normally. Then just use a program like mesh2rdm and/or GitMO to extract the textures that way.
PS: I don't think the gun's part of Snake's model.