Glock 30957 | Beavertail Backstrap Kit | Polymer | G26/G27/G33

The GLOCK Beavertail Modular Backstrap Kit (listed as part number 30957 in available sources) provides a factory-style method to alter grip feel and trigger reach on compatible Glock subcompact frames. The kit uses polymer components and the GLOCK Modular Back Strap System (MBS) to offer a small (integrated), medium and large backstrap without changing the grip angle. Adjusting backstrap size modifies trigger distance in small, reversible increments to better fit different hand sizes and shooting positions.

Typical applications include concealed carry and everyday carry (EDC) where grip fit and trigger reach affect comfort and repeatable control, and range practice where consistent hand placement improves follow-up shots and ergonomics.

Product Specifications

• The manufacturer part number is 30957.
• The UPC is 764503001352.
• The kit is compatible with G26 Gen4, G26 Gen5, G27 Gen4, and G33 Gen4 as stated in supplied materials.
• The construction material is listed as Polymer.
• The set includes a beavertail backstrap and additional interchangeable backstrap options described as small (integrated), medium, and large.
• The smallest backstrap is integrated in the MBS frame and reduces trigger distance by approximately 0.08 in.
• The medium backstrap increases trigger distance by approximately 0.08 in (resulting in a standard-frame reach).
• The large backstrap increases trigger distance by a total of approximately 0.16 in.
• The system is designed to adjust trigger reach without changing grip angle.
• The maker is listed as Glock in supplied attributes and copy.
• Finish/Color is listed inconsistently in source materials; please see notes for details (see notes).

This backstrap kit provides a straightforward, reversible way to fine-tune grip ergonomics for compatible Glock subcompact pistols. If you prioritize a tailored fit for everyday carry or range work, it’s a practical factory-style option that preserves grip angle while allowing meaningful adjustments to trigger reach.