F Strike Industries Strike Rail for AR-15 17" Blue $204.95 SI-StrikeRail-17-BLU show more like this $10 Flat for Firearms Cheaper Than Dirt F Strike Industries Strike Rail Free Float M-LOK Handguard AR-15 Aluminum - 504930 $204.95 SI-StrikeRail-17-BLU show more like this 9.50 MidwayUSA