WILL WORK ON GEN4 & GEN5!!!!
GLOCK Beavertail Backstrap Replacement Kit Gen 4 G17/22/31/34/35/37 & Gen5 G17
Glock’s GEN4 replacement backstrap kit comes complete with the standard and beavertail 2mm and 4mm backstraps. Includes trigger housing pin and multifunction clip that has a built-in polymer punch that assists in changing backstraps.