Well, since DMPS is now out of business, I wouldn't trust anybody that's vending a genuine DPMS spring - most vendors don't know what they're talking about anyway, and can't label parts right, or even understand why you cannot use an AR15 carbine spring in a .308AR... Which is exactly why I recommended the Armalite EA1095 spring. There's only one manufacturer, and they've been making that spring to the exact same specs, from the exact same materials, for many decades. It's dependable, it works really, really well, and it's made the same every time, from the same people. Stick with something that is a known, in the equation, instead of something that isn't made anymore, and people don't know how to advertise properly... That's my $0.02.