Hello CGN,
Until February 15th, 2018 receive a $100 coupon* towards Milling or Cerakote when you purchase a Glock 17 Gen 5 or pre-order a Glock 19 Gen 4 through the Black Box Customs webstore. Links are below.
*Coupon valid until February 15th, 2019. This coupon does not hold any cash value and cannot be used in conjunction with any other promotions.
Glock 17 Gen 5 from $808.00
Glock 19 Gen 4 $731.00