This Glock factory modular backstrap kit, with beavertail backstraps, fits the Glock 20 and 21 Gen 4. It lets you adjust grip size and add a beavertail for a higher grip on these large-frame pistols. It is a genuine Glock OEM part in black polymer.
- Brand: Glock OEM
- Type: Modular backstrap kit with beavertail
- Fits: Glock 20 and 21 Gen 4 (distributor also lists G40 and G41)
- Material: Polymer
- Color: Black
- Manufacturer part number: 30819
