Items listed by private sellers must be purchasable at the time it is listed..."Items may not be listed if they are already committed to be sold elsewhere, an example would be listing your gun here when it is already committed to be sold on gunbroker.".
I pm'd with a firm commitment on 12/17 to purchase a Smith 310. Responding PM's acknowledge the intent to set up meeting times/dates only to be met by non/extremely slow responses and a missed meeting (allegedly due to a work "emergency". Various PM's to reschedule throughout the week of 12/17 are on record, and as of 12/22 AM, I was still expecting to buy. Checked GB, and the Smith 310 was for sale with bids much higher than his ODT price.
Per the ODT rules- I have the confirming PM's showing I committed to purchase and the links/screenshots with dates showing the gun was for sale on GB, the same time I was expecting to purchase. No response from the seller saying they changed their mind or wanted more money. In the meantime, I passed on multi guns to purchase and even sold off 2 of mine to purchase his gun.