yes the Legion uses standard p226 mags I am not sure how they modified the mags to make them 10 round on some you can just replace the follower to make them full capacity in some the put pins or dents it the mag body those are more difficult to make full capacity

Francis - Yes, both pistols can use the same magazines. Rather than getting a pistol with 10 round magazines .. why not just get one with larger magazines to start with and save yourself the headaches. Magazines are a critical link in the chain of everything that has to come together to make a firearm function properly and it pays to get the 'good ones' you want in the first place.

Yes, The Sig P226 magazines fit and function in all P226 platforms. Just buy more larger capacity magazines and use the modified 10 round magazines as is. Start messing with them your asking for dependability, spring, follower issues