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AR15.COM
5/11/2009 9:32:00 AM EDT
Does RRA make a M4 profile barrels..
5/11/2009 9:37:13 AM EDT
[#1]
Yes and No.
They sell and use their version of an M4 profile barrel, known as the R-4.
http://rockriverarms.com/index.cfm?fuseaction=category.display&category_id=273
The difference is that this is a 16" version to be NFA compliant, whereas a true M4 barrel is 14.5".
I have heard that they sell a true 14.5" M4 profile barrel, but it requires them to permanently attach a Smith Vortex flash hider to be NFA compliant unless you fill out the paperwork for a Class 3 weapon.
http://rockriverarms.com/index.cfm?fuseaction=category.display&category_id=276
5/15/2009 4:51:20 AM EDT
[#2]
What's lighter the R4 -14 1/2 inch or the R4 lightweight  ?