We just got these in today. Limited quantities, get yours while they last!
https://www.reliablegun.com/en/sig-sauer-semi-auto-rifle-sig-mcx-556x45-16-keymod-carbine-handguard-thin-folding-stock-5rds-blk
https://www.reliablegun.com/en/sig-sauer-semi-auto-rifle-sig-mcx-556x45-16-keymod-carbine-handguard-thin-folding-stock-5rds-blk
