If you're ripping into the rims, it's one of two things (could be a third thing).
1. Sharp teeth on the edges of the extractor, just like that video I linked above shows. File them down.
2. Overgassed. Can't make a smaller gas port in the barrel, but you can add an adjustable gas block, as JT stated above.
(Possible) 3. Under-recoiled, from a bad recoil system, that's too light. Make the buffer heavier, make the recoil spring stronger. Use a matched recoil system with KNOWN-GREAT components. Never "trust" a manufacturer in what they say for recoil parts, unless they're a proven, solid, known recoil system manufacturer.
^^^ The "aftermarket" routinely fuks up #3... Routinely.