Picatinney for Remington R15
 

Is there a picatinney rail for the bottom side of the gas block on a Remington R15?

looks like it from the pictures...

No, none of the R15's have a rail on the bottom of the gas block.

If you want a rail on the bottom of the gas block then you are going to have to replace the gas block with a dual, quad, or modular rail gas block.

Like this one.

http://www.brownells.com/.aspx/sid=4...as_Block__only

Is a set screw mount good enough?

What do you mean a set screw mount?

HOw do these mount to the barrel? Are there set screws?

There is usually a notch in the barrel where a a roll pin indexes and secures the front sight and/or gas block in place. Some gas blocks use a set screw. All work equally well. Replacing the gas block isn't really hard to do. The issue with the R-15 is that it's camo dipped, while any replacement railed gas block will probably be black. If you don't mind this, then your options are wide open as the R-15 uses the same parts as any other AR-15 (it's a rebranded Bushmaster).

Mike


Mike