Gun broker still has 100 listed as available. These things are not exactly flying off the shelf
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Arms Unlimited website is down to 232, so they've sold 18.
I wonder if it is a true .223 cut chamber.
I know some Euro countries ( and South Amer. countries ) don't allow Mil. chamberings
CDNN is selling one on GunBroker. The barrel indicates 223Rem with a 1/7 twist.
https://www.gunbroker.com/item/989757369
Arms Unlimited lowered the price to $825, so I ordered one. I'll let you know if I find anything unusual aside from the serial numbers.
Its .223 for certain, vid below shows it conclusively.
https://www.youtube.com/watch?v=W-KjE8dSP9o
I bought a 901 from Arms Unlimited. If it makes you feel any better, I had to return it for a refund. It was missing a part (like the bolt catch or something else, but I don't remember) and things in the box along with the box label didn't seem right. I called Colt and the nice lady I spoke with told me that the receiver left Cost as a part, not as a complete rifle. I called Arms Unlimited and they admitted that they had assembled the rifle from parts they got from Colt. They took it back and I bought a factory built 901 from someone else for about $100 more. Arms Unlimited does have cool Colt stuff, but I'm wary when purchasing from them.