I'm going to order the #50 for one of my pre bans.
Are all the SIR's two different Colors?
Every picture I see the top and bottom look different shades?
Also what are these made of?
Yes, the top of the SIR is parkerized aluminum, lite gray and the handguard portion is delrin or zytel type polymer/plastic.... w/ handguard being closer to black in color. At least on the non-green models... Mike