I've grown tired of waiting around for Sig to ever release a large grip module. I'm 6'-9" with hands to match, every time I've picked up my X5 I love the feel of the grip but just wish it was a bit larger so I wasn't so crowded. With an entire weekend of rain swamping my area and all the kids sporting events cancelled, I decided to give my own modification a go.
I looked around online and found a product called apoxie which is a two-part modeling epoxy that has the consistency of modeling clay once mixed. After fully mixing the two parts and letting it sit for 5 minutes you can then start slapping it on your grip and sculpting. You have at least 30 minutes to an hour to work with it.
I had grip tape on it already that was bonded nice and good. To retain the ability to perhaps someday remove this if the fancy strikes me, I decided I would just put the epoxy sculpt right over top of this grip. Here is the grip with the epoxy molded onto it to provide the additional girth needed.
I gave it about 6 hours and it was already hard so I went ahead and sanded it to get a uniform width and surface finish. Fully wiped it down and cleaned it with alcohol as well to make sure I had a good surface for the next stage. Wanted to make sure that I didn't exceed the 1.5" USPSA box width. It is under that. I focused on putting additional material on the front with a finger groove, on the back to provide a hump and on the left and right sides as well.
Next step was masking tape, then some 15-minute epoxy brushed on. The application of 60/90 silicon carbide grit finished the process. I think it turned out pretty good. I felt like Alma Cole, just without any of the shooting ability.?
I'm going to let it fully harden overnight and do a clean and reassemble tomorrow. Just based on the girth from the apoxie alone it provided a significant increase in size that allowed my enormous left palm to actually come into contact with the grip! the silicon carbide grit application will provide a tiny additional increase in size.
PS. I uploaded the pictures through tinypic, which I've never used before. I hope they don't crap out.