Sterling DLO Mark4 or Mark5

[Battering ram NIB]

I was buying them for a while from a guy on line who would inspect every mag and rewrap them. I still got rust spots on 1/3rd of them.. the sterling mags have a major issue with rusting in the wrappers. not sure if its the type of wrapping or the mags themselves. if you buy 10 mags, expect 5 to have rust spots. I was reselling the mint ones for $99 and sold $4,000 worth making 100% markup on them. it seems like the mags are more plentiful right now than they were 3 years ago

the parts kit on GB is what I believe used to be the Sarges kit before they stopped selling them. I also think they reduced their price by $100 recently. its what I had my sterling made from. My barrel looked to be NOS. I bought one of these kits for a spare 8 months ago. it appeared to be the same as Sarges and the seller said he was the one who sold them to Sarges

 

[Traveler]

IIRC, the mags are coated with black oxide. By itself black oxide is only mildly anti-corrosive. For it to be effective it needs to suck up oil or wax like a sponge. I think as the years go by the paper wrapper absorbs the oil and degrades the corrosion protection of the coating. So, it’s a combination of the coating and the wrapper that leads them to rust.