Thank you.
I used a dremel drum sanding wheel for both. On the undercut, I began with the large drum wheel (60 grit, I believe). It fit perfect for the shape I wanted to create (which is the stock shape, somewhat - and just deepened). I would work a little up into the guard and then along it, beveling the length of the trigger guard very lightly as I went. This kept me from going too far up, as I've seen where it appeared guys had gone just straight up into the undercut without thought given to fitting it all together. So, cut a little deeper, then shape it all out. Then work a little more, etc., etc. I would periodically switch between the large drum and smaller diameter wheel, same grit. The smaller wheel just allows for more control on shaping. As with anything, remove a little and check the work before going on. A fresh sanding wheel will remove polymer relatively quick so take it easy. Also, if you'll notice, I rounded the sides of the undercut as I went, which is why it appears in shadows that I cut all the way into the trigger area; it's just rounded. It's not necessary, but I think it looks goofy when it is cut parallel to the bottom of the trigger guard; just my personal preference.
As for the mag release scallop, I just used the small wheel. I began with the grip-side corners and just rolled it into the shape I wanted. It starts out ugly but pulls together pretty well.
The front of the trigger guard I believe was the large wheel. I may have used the small one for final shaping, but removal was the large one. That took only a few minutes once I got into the polymer.
After all that, I took to it with progressive grades of sandpaper: following the 60 grit wheel, I hit it all with 120, 220, 320ish, 400 and finished it with 600 (all just small pieces of paper, handheld). I really had to get after it with the larger grit pieces early on since the 60 grit dremel wheel "scars" it pretty bad. So really dig at it with each grit or you'll have scars when it's polished (like I did my first time around). This step also lets you do some micro-shaping and get the final shape you want. I capped it all off with a buffing wheel to put some shine on it, but it is purely cosmetic and doesn't do much else; just to keep it purty 'til it gets a new coat.
Really pretty easy stuff. I'd never done it before, but after looking at hundreds of pictures over time and deciding what I did and didn't like, it came pretty easy. Oh, and wear a mask. I was blowing black snot for a day or so after.
Wish I'd taken more progressive pics, but here are a few from early on before polishing:
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Originally Posted by MM OneSix
Thank you.
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