Description

The SP5K 3-Position FRT Trigger Housing is engineered to provide a rigid, precisely aligned interface for forced-reset trigger operation on short-length SP5K / SK platforms manufactured by Heckler & Koch.

The housing body is printed from carbon-fiber–reinforced ABS, selected for its balance of strength, heat resistance, and dimensional stability. Compared to standard polymer housings, carbon fiber reinforcement significantly reduces flex under load while maintaining a lightweight profile—critical for consistent selector engagement and repeatable trigger behavior on K-length systems.

To reinforce high-stress areas, dual metal plates are integrated at the fire control group (FCG) interface, adding rigidity and helping ensure precise internal alignment over extended use. This reinforcement is especially important on SP5K platforms due to their reduced bolt travel and tighter operating window.

REQUIREMENTS / COMPATIBILITY

• SP5K / SK (HK) platforms only

• HK MP5-pattern receiver in short (K) configuration

• Properly configured fire control components

❌ Not compatible with full-size SP5, mid-length variants, or SD models
⚠️ Verify model length before purchase

⚠️ This trigger housing is designed exclusively for SP5K / SK platforms and is not compatible with full-size SP5, mid-length, or SD variants.