Full Size MP5/SP5 Conversion Kit Housing

Description:

The MP5 3-Position Conversion Housing enables Super Safety compatibility in MP5-pattern builds, providing a durable, purpose-built solution where factory housings fall short.

This will work with HK SP5, PTR9 CT 9RS, AP5, MAC, ZF5, P0F5.

Comes with metal reinforcement plates around the hammer/trigger holes to prevent cracks. A set of custom length antiwalk pins is included to handle the wider width of the plates.

Constructed from high-strength, heat-treated carbon fiber reinforced nylon, it offers excellent durability, impact resistance, and precise tolerance retention under heavy use. The matte finish and factory-style ergonomics preserve the original MP5 feel while ensuring proper fitment, alignment, and reliable Super Safety operation.

Key Features

• Designed for MP5-pattern platforms
• Enables Super Safety system compatibility
• Carbon fiber reinforced nylon construction
• Lightweight, rigid, and highly durable
• Factory-style ergonomics and grip angle
• Matte finish for a clean, professional look

TROUBLE SHOOTING

Trigger Not Resetting

Symptoms:

• Trigger fails to reset
• Inconsistent reset during cycling

Fixes:

• Ensure conversion housing and trip are fully seated
• Cycle the charging handle 10–20 times to mate components
• Verify proper installation and alignment

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Rough or Stiff Cycling

Symptoms:

• Charging handle feels stiff
• Bolt carrier does not move smoothly

Fixes:

• Clean and lubricate bolt carrier and contact surfaces
• Check for debris or interference
• Ensure proper clearance between components

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Inconsistent Function

Symptoms:

• Unreliable or inconsistent operation

Fixes:

• Confirm compatibility with MP5/SP5 platform
• Verify proper installation of all components
• Ensure bolt carrier cycles freely

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Proper installation, lubrication, and free bolt movement are critical for reliable operation.