Colt HBAR 5.56 or .223 chamber?

[Patrick L]

Does anyone know if my mid 1990s vintage Colt HBAR has a 5.56 chamber or a .223 one?

My receiver is marked "Cal .223" but the barrel says "5.56 Nato 1/9 HBAR" on the top forward of the front sight.

Any Colt AR experts out there?

[Roundnoser]

Mine reads CMP 5.56 NATO 1/7 HBAR on the barrel and .223 on the receiver.

I purchased it in 1992-93....just before the Clinton Assault weapons ban.

[GT27]

Ask the same question at the AR15.com forum(Dano) there,he will have a definitive answer for you,I trust him,he has forgotton more about this platform than most will ever learn,including me:mrgreen:...GT27:coffee:

[Longone]

Go with what is stamped on the barrel.

Longone

[Mooseman]

The MP is for magnipartical tested.
5.56 is the chamber on the barrel,
Colt marks the civilian lowers as .223 while they mark LE and Military guns 5.56 !

Rich

[Patrick L]

Thank you, guys!