Both blasters have a tactical rail and none have a reverse tactical rail meaning you cannot attach them. The only real way is to get a key chain clip and attach it from the bottom of the Reflex IX-1 to the top of the cocking slide on the Maverick REV-6.
Crossfire/Strikefire
The NERF Maverick can indeed shoot whistler darts.
Not without serious modification, if possible. Although both of them have racks on the top, those racks are meant to hold specific accessories (sights, flashlights, etc.) and not other nerf guns unless the other nerf gun has the other rack type. Although there is a small number of nerf guns that can attach to others, the maverick and night finder aren't meant to be combined. Both the maverick and night finder can attach to nerf guns with the opposite rack type, like the crossfire and scout. Just not to each other, since they both have the same rack type.
No, the Nerf recon is more powerful.
There is'nt any more
20cm
No. The only nerf gun you can attach to a raider is the dart tag strikefire.
No Nerf did not, but Nerf did make a clear maverick shown here: \http://3.bp.blogspot.com/_Rwilj6uxGkQ/SX0sHA53AxI/AAAAAAAAAFY/1qRyAafCido/s400/DSC01951.JPG
Yes
Yes
The Barricade