M16 Rifle barrel extension v M4 barrel extension

CWulf

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I am hoping you guys here can help with my AR15 education.

I was looking at some AR 15 uppers on a couple of vendor sites. One that looked interesting was on the Bravo site and it is an M4 Flat top and the description says “This receiver has the M4 feedramps machined in. This is to be used with barrels that include the M4 barrel extension”.

The other option on that site just says Upper Receiver – Flat Top with this in the description. “The receiver is made for barrels with a standard M16 Rifle barrel extension”
What's the difference between the M4 barrel extension and the M16 barrel extension?

http://www.bravocompanyusa.com/AR-15-Upper-Receiver-s/33.htm

I am looking for an upper for a Spikes Tactical lower I got a couple months ago. Which would you recommend and why?

As always, thanks for the help…
 
in a nutshell:

hgGMxZx.jpg


i do not believe there's a difference other than M4 and standard feed ramps.
 
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