Barrel Markings

[Col_Crocs]

Bushmaster barrels are marked "B MP NATO 1/9", basically like Colt's "C MP NATO 1/7" Does the MP on BM barrels mean their barrels are actually HP Tested and in turn MP Inspected after like Colt's?

[Frens]

Bushmaster barrels are marked "B MP NATO 1/9", basically like Colt's "C MP NATO 1/7" Does the MP on BM barrels mean their barrels are actually HP Tested and in turn MP Inspected after like Colt's?

yes

BUT

BM does batch tests while Colt tests every single bolts & barrels

[5pins]

If the NATO standard is 1/7 then how can they put NATO on a barrel with a 1/9 twist?

[markm]

If the NATO standard is 1/7 then how can they put NATO on a barrel with a 1/9 twist?

NATO refers to the chamber spec.

[Col_Crocs]

Thanks!