I used the outers for the first time here recently on my M1A after putting about 80rds thru it. One 30min soaking with the foam DID remove all the copper. So I gave it another 30min soaking to make sure - no more copper, but still plenty of carbon fouling. Gave it another 30min soaking.............still lots of carbon fouling. I still ended up brushing & patching it quite abit with MPro7 to get all the powder/carbon fouling out.

So I'd say the Outers stills needs a little help with the powder fouling - but works great on copper. Next time I use it, I'm gonna brush and patch it a little with MPro7 first to break the fouling up and THEN use the Outers - maybe that will speed up the process.