Shop › MIDWEST 14" SLIM LINE HANDGUARD MIDWEST 14" SLIM LINE HANDGUARD $173.95 Midwest Industries Slim Line Handguard, 14" Length, M-LOK. Aluminum, Fits AR-15 Rifles, Includes 5-Slot Polymer Rail, Black Anodized Finish MI-SLH14 Quantity: Add To Cart Added! Midwest Industries Slim Line Handguard, 14" Length, M-LOK. Aluminum, Fits AR-15 Rifles, Includes 5-Slot Polymer Rail, Black Anodized Finish MI-SLH14