It is compatible with Glock generations (Gen 1, Gen 2, Gen 3, Gen 4 and Gen 5*) of Glock in double stacked standard frame 9mm and .40 S&W. The ACE Trigger System is not compatible with slimline or large frame (.45 ACP) variants, and clones are still to be determined.
*Gen 5 requires removal of small tab on frame (refer to your instruction manual and/or watch this video).