PTR CS1 - Collapsible Stock

Compact Four-Position Adjustment

The PTR CS1 Collapsible Stock gives PTR’s full-size 9mm platforms an adjustable stock configuration without unnecessary complexity. Four open positions span a 3-inch adjustment range, allowing the stock to move from a compact collapsed profile to progressively longer extension settings. An easy-access paddle release controls the adjustment, making the stock’s position straightforward to change while keeping the mechanism integrated closely around the rear of the receiver.

Polymer Body with Steel Rail Support

The CS1 combines a durable polymer body with steel adjustment rails, using each material where its characteristics are most useful. The polymer body avoids making the entire assembly from metal, while the steel rails provide the structural support required for the collapsible mechanism. The complete stock weighs 1.19 lb and extends only 3.5 inches beyond the receiver when closed, preserving the compact character of the platform when fully collapsed.

Ambidextrous Control and Integrated Sling Attachment

The adjustment system is designed for operation from either side, giving right- and left-handed users the same access to the stock controls. An integrated QD sling mount adds a dedicated attachment point directly to the stock assembly, eliminating the need for a separate sling interface at the rear of the firearm.

Built Around PTR 9mm Platforms

The CS1 uses an end-cap, single-pin mounting configuration and is designed for the PTR 9C, 9CT, 9CT-CL, and 9R. Its four-position architecture provides these platforms with a compact alternative to a fixed stock while retaining a purposeful fit around the PTR receiver and recoil-system configuration.