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9/19/2017 7:27:10 PM
Posted: 10/24/2003 3:26:23 AM EDT
I recently purchased an M4 upper. The barrel is marked "B MP 5.56 NATO 1/9". It has a pinned break. Is this a Bushmaster barrel?

Thanks for your help.
Link Posted: 10/24/2003 4:10:18 AM EDT
Yes it is a Bushmaster and you probably have a Mini-Y comp or AK74 style brake on the end.
Link Posted: 10/24/2003 4:12:03 AM EDT
VA beat me to it, but yes, it's Bushy... [url]www.biggerhammer.net/ar15/barrelsbolts[/url]
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