It worked great with the co2 ACP with no issues. Works ok with my propane powered Marui G17 but sometimes doesn't cycle all the way back. I modified the g17 clip to fit the fiber sights on my g17 (shown in pic). The set screw also doesn't go all the way on the g17 clip (pic), but it doesn't seem to make a difference. Been that way since I got it. Has a clip for the ACP and one for G18 too.  Includes the stuff shown, even the "magpul" flip up sights. It is sold as-is with no returns. Price includes shipping and fees. Pay pal only. No local pick up.