M4 Ramps?

[Pirate69]

Looking at a barrel stamped: 8 mp 5.56 nato 1/9. May be B mp 5.56 nato 1/9. Appears it may be a Bushmaster barrel. Is there any way to determine if it has M4 ramps?

[OptimusPanda]

I had seen this picture before and went looking for it have a peek.
http://www.ar15fornoobs.com/wp-content/uploads/feedramps.jpg

[Pirate69]

thanks. that helps

[deltaenterprizes]

Looks like older feed ramps can be opened to M-4 configuration