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Agreed. At 90% condition, I’d expect around $700 on Gunbroker.
A local gun store would probably ask $850 and sell it after, oh, two years or so haha.

Would love to see pictures of it!

You're right around fair value at $600. Civilian versions go for around $300.

By the way, this is the only gun I've owned thus far that can actually be taken apart wrong. TRUST ME. If you do...