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Sam, Sig has recently switched over from the Key-Mod to the more popular M-Lok so a few M-Lok rifles are floating around. I would call Buds to verify exactly which this is before purchasing at LiveChat (available from 9AM to 9PM 7 days a week), the "Blue chat now" button at the bottom right of the page, or phoning at (859) 368-0371 (available 9AM to 9PM EST Monday through Friday).

it comes with the M-lok The picture is a "stock" photo the upc crosses to the M-lok handguard. From the buds listing "*Please Note!! Many of our pictures are stock photos provided to us by the manufacturer and do not necessarily represent the actual item being purchased." specs Specifications and Features: SIG Sauer M400 Elite AR-15 Semi Auto Rifle RM400-16B-E Direct Gas Impingement 5.56 NATO (Accepts .223 Remington) 16" Barrel 1:7" Twist Rate 30 Round Magazine ************Free Float M-LOK Compatible Hand Guard********** Polymer Pistol Grip 6 Position Telescoping Stock with QD Points SIG Sauer Enhanced Trigger Overall Length Collapsed 32" and 35.2" Extended Overall Weight 7.3lbs Matte Black Finish

it comes with the M-lok The picture is a "stock" photo the upc crosses to the M-lok handguard. From the buds listing "*Please Note!! Many of our pictures are stock photos provided to us by the manufacturer and do not necessarily represent the actual item being purchased." specs Specifications and Features:
SIG Sauer M400 Elite AR-15 Semi Auto Rifle RM400-16B-E
Direct Gas Impingement
5.56 NATO (Accepts .223 Remington)
16" Barrel
1:7" Twist Rate
30 Round Magazine
************Free Float M-LOK Compatible Hand Guard**********
Polymer Pistol Grip
6 Position Telescoping Stock with QD Points
SIG Sauer Enhanced Trigger
Overall Length Collapsed 32" and 35.2" Extended
Overall Weight 7.3lbs
Matte Black Finish