This is the HC9XL 3.0 compensator that is designed for the gen 4/5 Glock 19, 17 and 26 that will fit ALL 1/2-28 barrels! Herrington Arms has listened to what you all have been asking for and this is a combination of all of it! They made the port size nearly 2X the size of the micro comp, but small enough no spent brass can enter the port. They where asked to form the comp to the front of the pistol, so they did! The compensator is 100 percent reliable with the stock springs running +p, 115gr, 124gr, and 147gr ammo, meaning you don't need to change a thing! Made from CNC machined high quality 6061 aluminum and coated with a black Cerakote finish, this comp looks amazing on OEM or Gucci Glocks. If you want a reliable and effective compensator that will always be 100%, this is it! Product Features Made from highly durable and lightweight 6061 aluminum 40% Vertical recoil reduction along with horizontal stabilization that makes follow-up shots a breeze. HC9XL 3.0 Successfully passed the 4000-round durability test Product Specifications Material: 6061 Aluminum Finish: Black Cerakote Compatibility: Glock 17/19/26 with 1/2-28 Barrels and must be GEN 4-5 Glocks Included: 5*64 Allen key *Note: O-Ring must be removed to fit flush DISCLAIMER: GLOCK is a federally registered trademark of GLOCK, Inc. and is one of many trademarks owned by GLOCK, Inc. or GLOCK Ges.mbH. Neither Sportsmans Outdoor Superstore nor this site are affiliated in any manner with, or otherwise endorsed by, GLOCK, Inc. or GLOCK Ges.mbH. The use of GLOCK on this page is merely to advertise the sale of GLOCK pistols, parts, or components. For genuine GLOCK, Inc. and GLOCK Ges.mbH products and parts visit www.glock.com.