AIM Sports Inc M-LOK Handguard for H&K 91 Carbine Variant Black Medium. Superior ergonomics and simple drop-in installation makes this the best HK pattern rail on the market. Specifications for AIM Sports Inc M-Lok Handgaurd for H&K 91: Manufacturer: AIM Sports Inc Gun Make: Heckler & Koch Gun Model: Heckler & Koch HK91 Handguard Length: 12 in Color: Black Gun Rail: M-LOK Weight: 7.5 oz Condition: New Included Accessories: Standard Gun Type: Rifle Quantity: 1 Features of AIM Sports Inc M-Lok Handgaurd for H&K 91 Compatible with most HK33 variants made in specialized factories steel mounting hardware Black anodized 6061 T6 aluminum One piece drop-in design 5 rows of M-Lok for ultimate modularity Package Contents: AIM Sports Inc M-Lok Handgaurd for H&K 91 What firearm models does the manufacturer say AIM Sports Inc M-Lok Handgaurd for H&K 91 is compatible with? The manufacturer suggests that AIM Sports Inc M-Lok Handgaurd for H&K 91 is compatible with Heckler & Koch HK91AIM Sports Inc MMH91: M-LOK Handguard for H&K 91 Carbine Variant Black Medium