Corrosion and durability:
I shoot rain, or shine, mostly at a ranch. I’ve also carried a gun my entire adult life, so I know how to treat a gun like it doesn’t belong to me.
For vibration resistance, it rode in the (lined) bed of my truck, to and from the ranch, uncased, like 45min, each way. It got dropped a few times, nothing stupid, and casually bumped into things such as would happen inside a structure. Nothing broke, fell off, or became loose. General bumps and bruises, there’s one spot the finish wore a little early: the forward assist. But, its holding up really well.
It got rained on a lot, and shot in the rain, and got drowned in a puddle overnight. Most of the gun is, in fact, corrosion resistant. Even the phosphate exterior of the barrel. I oiled it, because I’m not a maniac, but that smoked off a while back. But, no rust there. The place its deficient is the bolt carrier and action spring. We’ve already identified known options to overcome that for the production model. Otherwise, it’s done pretty well, and this is outright abusive treatment.
I haven’t noticed any undue wear on the inside of the rifle. It still shoots well and will probably last a long time. I’ll update this thread if anything breaks or wears out, but ammo is kinda scarce right now.
Overall, I think this is a high-quality general-purpose rifle. It does a lot of things well, without being a chubby bastard.