Chaz,
I'm was in the same boat as you are a week ago. I bought a G2 Surefire for my AR at a recent gun show, and wanted to mount it on the front site tower. Unfortunately, I have much more free time than money, so I couldn't see spending $50 on that Brownelss mount (it's very nice looking), or more on the GGG SLiC mount, and another $30 for the Fobus clamp, so I made a front sight tower mount from the instructions I found here on the Maryland AR15 Shooter Site:
[url]http://groups.msn.com/TheMarylandAR15ShootersSite/frontsitelightmount.msnw[/url] =Make a Front Site Tower Light Mount
I bought some aluminum from Home Depot (1.5" x .25" x 3') for $4, some small #6x32 1" screws, washers and nuts, and a few nylon spacers with a .25" ID. I also got the #29 Weaver mount from a local gun shop that was $4, and I had some Brownells Teflon Gun paint in matte finish already. I followed the instructions and made the two halves that fit int the sight tower perfectly on each side in about an hour, filed and sanded them, then painted them and the hardware with the Teflon matte Gun Cote. I had a spare Weaver 1" ring already, and mounted the light on the left side of the sight tower when the paint had dried, and I had baked it for 20 min to harden the finish. I think I came out great, and my investment for the whole thing was about $10. My supporting left hand is in a perfect position to push the tail cap of the G2 with my thumb, and it's right on the money and square to the bore. At 5', the light illuminated everything in my sights when I tested it. I'll post a few pics tonight when I get home.
Images added 9.5.03:
[img]http://www.whalendesign.com/ar15/surefire1.jpg[/img]
[img]http://www.whalendesign.com/ar15/surefire2.jpg[/img]
[img]http://www.whalendesign.com/ar15/surefire3.jpg[/img]
[img]http://www.whalendesign.com/ar15/surefire4.jpg[/img]
Oh, one more thing: I used red Locktite to keep the nuts on during recoil!