USED Lancer Systems Mcx Carbon Handguard Carbon Fiber - LCH-MCX-12. Factory replacement. Cooling slots in the composite tube will accept M-Lok accessory rails. Specifications for Lancer Handguard Sig Mcx 12" M-lok Carbon Fiber: Type/color: 12" handguard Size/finish: Sig mcx/black Material: Carbon fiber Package Contents: Lancer Handguard Sig Mcx 12" M-lok Carbon Fiber The Lancer Handguard Sig Mcx 12" M-lok Carbon Fiber is a quality addition to the Lancer Systems lineup. For more great deals on Rifle Handguards by Lancer Systems please browse our Lancer Gun Parts page. What firearm models does the manufacturer say Lancer Handguard Sig Mcx 12" M-lok Carbon Fiber is compatible with? The manufacturer says that Lancer Handguard Sig Mcx 12" M-lok Carbon Fiber is compatible with SIG Sauer MCXLancer Handguard Sig Mcx 12'' M-lok Carbon Fiber