Hi Anthony and welcome. The ATLAS R-ONE Anodized Black handguard is exactly 16.6 inches in length. Cheers, stay safe and enjoy! M-LOK Picatinny Rail Sections for accessory attachment here: budsgunshop.com/search.php/q/mlok+rail+section

Hi Anthony, the handguard is 16.6"
Manufacturer: Aero Precision
Cartridge: .223 Wylde
Barrel Length: 18 in
Barrel Profile: SPR
Barrel Twist Rate: 1-8
Threads per Inch: 1/2x28
Muzzle Device: A2 Flash Hider
Gun Model: AR-15
Condition: New
Fabric/Material: Aluminum/Steel
Gas Block Journal Size-Diameter: .750 in
Handguard Length: 16.6 in
Gun Rail: M-LOK
Gun Type: Rifle
Gun Make: AR Platform
Included Accessories: None
Barrel Material: 416R Stainless Steel
Weight: 68.5 oz
Magazine Included: No
Country of Origin: USA
Model: M4E1
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Stay safe & have a great day!

M4E1 Threaded Complete Upper w/ 18 .223 Wylde QPQ Rifle Length Barrel and 16.6" ATLAS R-ONE Anodized Black handguard.

That is the Atlas R-One 16.6" handguard