At the core of their PRO trigger is ZEV's proprietary trigger bar and professional connector. These products deliver the crispest cleanest trigger pull available. Their new trigger pad features a revolutionary riveted assembly process that makes it the longest lasting and most reliable replacement trigger on the market.G19 G17 G34 G26 G17L G22 G23 G27 G35 G24 G37 G38 G39 G31 G32 G33Includes: ZEV PRO curved face riveted trigger ZEV trigger bar ZEV PRO connector