Yes you can modify 10rdn mags but it is better to invest in new ones from SA directly IMHO. I have an XD 40 service with 2 10rnd mags that came with it and they work great, the 12 rnd mags that I got from SA are very stiff even after leaving them loaded for a week it is still hard to get 12. When Clinton Gun Ban expired I called SA to order 3 new 12rnd mags and it took about 1 1/2 months to get and they have already changed again to glock like mags in which you can see all 12 rnds. Hope this helps. There are posts on this site somewhere that show modified mags.impcmonk said:I'm wondering what the difference between the 10rnd mag and the 12rnd mag. Is there something you can modify on the clinton mags to make them hold 2 more?