UTG Pro RBUS3BM Mil-Spec 6-Position Collapsible Stock Kit AR-15 M16

The UTG Pro RBUS3BM delivers reliable mil-spec performance for AR-15 and M16 platforms with precision-machined components and field-proven durability. This complete stock assembly provides six adjustable positions for optimal length of pull customization across different shooting scenarios.

What Makes This Different

Unlike basic commercial-spec stocks, the RBUS3BM meets true mil-spec dimensional tolerances for consistent lockup and zero wobble. The reinforced polymer construction withstands impact stress that would crack standard stocks, while the dual-locking mechanism prevents unwanted movement during rapid fire sequences. Internal steel reinforcement plates distribute stress across critical load-bearing points.

Key Features

• Mil-spec diameter buffer tube compatibility (1.146" outer diameter)
• Six-position adjustment range accommodating 13" to 16.5" length of pull
• Dual-side release levers for ambidextrous operation
• Reinforced polymer body with internal steel stress plates
• Quick-detach sling swivel cup integrated into rear cap
• Anti-rotation tabs prevent buffer tube movement
• Textured grip surfaces for secure handling with gloves

Field testing demonstrates consistent lockup across temperature extremes from -20°F to 140°F without binding or loosening. The positive indexing system maintains zero repeatability when switching between positions, critical for precision shooting applications. Competition shooters benefit from the quick adjustment capability between prone and standing positions, while tactical users appreciate the silent positioning system that eliminates metallic clicks.

Technical Specs

• Overall length: 7.25" collapsed, 10.25" extended
• Weight: 8.2 ounces complete assembly
• Material: Glass-filled polymer with steel reinforcements
• Finish: Matte black anodized buffer tube, textured polymer stock
• Compatibility: AR-15, M16, and mil-spec lower receivers
• Buffer tube: 6061-T6 aluminum, hard anodized
• Includes: Stock, buffer tube, castle nut, end plate, buffer spring, buffer
• Country of origin: Taiwan

The RBUS3BM stock kit provides the foundation for consistent accuracy and reliable function that serious shooters demand. Complete assembly takes minutes with basic tools, delivering immediate upgrade performance over factory configurations.