SRU SARB15 M4 Lower Receiver Spare – Short Buffer Tube

Spare Lower Receiver with Compact Buffer Tube for SARB15 Builds

This SRU SARB15 spare lower receiver includes a short buffer tube, designed for use with SRU’s SARB15 bullpup chassis kits on M4 GBB platforms. It serves as a direct replacement for damaged or modified receivers and ensures full compatibility with the SARB15 system.

Optimized for Bullpup Configuration

The included short buffer tube allows for the SARB15’s compact bullpup layout by eliminating the need for a full-length buffer system. This ensures a stable rear mounting point without interfering with the body’s ergonomics.

Durable Polymer Construction

Molded from reinforced polymer, the lower receiver offers structural integrity under repeated use. It is lightweight yet strong enough to handle GBB cycling forces and maintain alignment with the upper chassis parts.

Use Case

This component is ideal for users who need a replacement part for their SARB15 build, or for custom projects that require a shortened buffer solution compatible with GBB M4 lower receivers.

Key Features

• Spare lower receiver with short buffer tube
• Designed for SRU SARB15 GBB bullpup configurations
• Lightweight and impact-resistant polymer
• Maintains chassis alignment and structural support
• Compatible with M4 GBB platforms