Please keep in mind that all Sequoia Arms/Iron Ridge Lowers with the Serial Numbers starting with IRS-0001-0050 will NOT be covered under warranty by Iron Ridge Arms Company. All of these Lowers are manufactured by Sequoia Arms under a license agreement.
They are all manufactured By: Mike Austin SEQUOIA Arms with Jim Madgen, and sold out of San Rafael CA.
If you have any questions please contact Iron Ridge Arms for details.