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Hi John and welcome. Yes, Hornady Frontier 5.56 NATO ammunition, including the hollow point match loads, features sealed primers and case mouths. Cheers, stay safe and enjoy!

Hi John, yes Hornady Frontier are sealed to M193 specs >>> https://www.hornady.com/ammunition/rifle/5.56-nato-55-gr-fmj-(m193)-frontier-oriented#!/ Stay safe & have a great day!

Good evening to you!! The Hornady Frontier 5.56 is seal ber mil spec M193. Primers and case mouth. Have a good rest of your weekend.

Yes they are. Full information & Specs at link below. https://www.hornady.com/ammunition/rifle/5.56-nato-55-gr-fmj-(m193)-frontier-oriented#!/