Grey Ghost Precision has a 25% Off Discount on GGP Glock Barrels, as well as newly released GGP AR-15 and AR-10 handguards in various lengths. These are the same MLOK handguards featured on their MKII line of production rifles, but are now available separately for the builder at heart. Browse Handguards here or Barrels here.
If you had your eye on something else from Grey Ghost Precision, they are offering 20% Off and Free Shipping on everything else sitewide thru July 6th. No coupon code needed, just add items to cart to activate the discount.