GBI

Is it like the F.B.I.

Here's what I found... (Would probably work best on a rectangular cake.)

Liked this one, would use a Christmas tree as "center" of the target:

http://www.piece-a-cake.com/images/large-gun-cakes.jpg
(This has a really nice drawn auto on it.)

Here are some printable targets. Would replace the "targets" with Christmas trees - and have a 3D handgun on the side:

http://reloadbench.com/pdf.html

Nice 3D gun on Glock cakes:
(This is just to show the guns, the cases aren't very Xmasy.)

http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1295026

http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1469073

You could also draw or do a FBCT of an automatic...

http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=62518

How to draw a Glock model 17:

http://www.dragoart.com/tuts/214/1/1/how-to-draw-a-glock-17-9mm-hand-gun.htm

http://www.dragoart.com/tuts/214/2/1/easy-step-by-step-drawing-instructions-for-how-to-draw-a-glock-17-9mm-hand-gun.htm

HTH