One thing about blow-back operated guns is that they are typically dirtier than gas operated ones because the blow-back operation permits the bolt to begin traveling rearward much sooner. As a result more of the combustion gases - and unburned propellant - enter the action, causing it to foul sooner than a comparable gas-operated gun. It is the nature of the beast, and the price one pays to eliminate the complexity of gas operation.
We have been recommending shooters use spray-on dry gun lubricants instead of oil to reduce deposits and fouling. However, we recently discovered a product that works even better, and we have modified our owners manual to highly recommend it use. (And, no, we do not sell the product ourselves. We are strictly users of it.)
The product is called Slip2000 EWL (Extreme Weapons Lubricant). It works like nothing else we have seen. When we were using dry spray-on lube we still had to clean fouling deposits with Hoppes cleaner and a brush. Hoppes is good stuff, but it would still take some scrubbing to get all of the deposits off the bolt and out of the ejection port area. Slip2000 is both a lubricant and a cleaner, however. It SIGNIFICANTLY reduces deposit buildup, and now the only thing I use to clean fouling deposits from the gun are Slip2000 and a Q-tip. No Kidding!
I am not one to easily gush over a new product as being superior to others. In fact, I typically question any manufacturer's claims of product superiority. I will say, though, that I have never seen anything like Slip2000. We buy it from our present distributor, but there may be others. You can find contact info for them at
www.slip2000.com. (And you want the Extreme Weapons Lubricant, not the EWG - Extreme Weapons GREASE)
Sorry for sounding like a commercial, but this stuff will make operating and cleaning any gun so much easier - as anyone who tries it will see. I just had to share.