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Hi and welcome. This model has a 20-inch heavy-profile barrel with a 1:8" twist offers superior accuracy and stability—ideal for target shooting, long-range training, or hunting applications. Its threaded muzzle (1/2x28) is ready for a compensator or suppressor. Cheers, stay safe and enjoy! I would contact Springfield Armory Customer Service on the specific barrel stamping at -- https://support.springfield-armory.com/contact-us
This is Springfield Armory take on the M16A2. The barrel is 20" chrome lined 1:7 twist chrome moly barrel. Contact Springfield Armory for barrel markings. Full specs can be seen here: https://www.springfield-armory.com/ar-series/sa-16-rifles/sa-16-a2-556-rifle/ https://support.springfield-armory.com/contact-us
It does have a Heavy barrel, as far as if that is stamped on the barrel, I'd contact Springfield Armory.
If you are wondering if this is MD legal, it is not, per the SA web site. Stay safe & have a great day!
