Under the handguards, on top of the chamber. If it's more than a year or so old, it will have a letter, a number, and a letter. If it's a newer barrel, it will have 3 numbers.
Here's what the markings mean if they are there:
Applicable "codes" for 223 barrels:
Old Codes: Three characters side by side over the chamber. First Character: N or W...N for NATO chamber or W for Wylde Second Character: 8 or 9...8 for 1:8 twist and 9 for 1:9 twist. Third Character: A, S, or C...A for moly (chrome -moly Alloy), S for Stainless, and C for Chrome-lined alloy.
New Codes: The actual base part number from our parts system/catalog, located over the chamber. These are the most common. Unless indicated otherwise, all stainless barrels are 1:8 twist and all moly barrels (chrome-lined or not)are 1:9. All 16" moly barrels have a NATO chamber, while the 20" moly and all stainless barrels have a Wylde chamber.
200 =moly CAR 200CL =Chrome-lined CAR 202 =moly R4 204 =Chrome-lined R4 206 =Stainless CAR 208 =16" varmint 210 =moly Mid 212 =Chrome-lined Mid 215 =Stainless Mid 218 =18" varmint 220 =moly Std (rifle) 222 =Stainless NM(rifle) 223 =Stainless NM (rifle), unthreaded 226 =20" varmint 228 =24" varmint (1:8) 229 =24" varmint (1:12)
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Quoted from Steve/RRAMODERATOR
HERE.
WIZZO
EDIT: beat by theshootersden