Not much available cause not needed. As everyone has said, it is a gun that needs nothing but ammo straight out of the box. And it shoots like a dream without any need of mods. The only thing you can really change or mod on it are the sights, grips, magazines, smoothing trigger pull, shorter trigger, and the finish coating. But the trigger pull on the Sig is one of the nicest around of any gun, out of the box. But these things sound more like cosmetic touches than mods.