Model 1500, Trophy Standard in very good condition, around $450
125
500 USD
Twist is 1:12
$700
No sn data that I am aware of.
A rifle with a 5.56x45 chamber can utilise .223 Remington cartridges. A rifle with a dedicated .223 Remington chamber cannot accommodate 5.56x45 cartridges. A rifle with a .223 Wylde chamber can accommodate .223 Wylde, .223 Remington, and 5.56x45, but neither a rifle with a 5.56x45 or a .223 Remington chamber can accommodate the .223 Wylde cartridge.
What about it? You haven't asked a question.
.223 Remington can be cycled in a 5.56x45 rifle; 5.56x45 should not be cycled in a .223 Remington firearm.
1500 give or take.
safe yes, smart no.
no
Depending on condition, 100-400 USD.