Colt M4 Commando Enhanced 4 Position Selector Group C4PSG UPC N/A
Product Description
The Colt M4 Commando Enhanced 4-Position Selector Group (C4PSG) is an authentic OEM fire control component engineered specifically for military, law enforcement, and registered NFA full-automatic M16 and M4 platforms. Designed to expand operational select-fire capability, this enhanced group allows the host firearm to cycle through Safe, Semi-Auto, 3-Round Burst, and Full-Auto firing modes when installed in a compatible lower receiver equipped with the appropriate 4-position mechanical trigger group.
Precision-machined from high-strength forged steel and treated with a Mil-Spec manganese phosphate surface conversion coating, the C4PSG components resist corrosion, carbon fouling, and intense wear under sustained firing schedules. The selector axis features specialized timing cams engineered to index cleanly against the trigger tail, disconnector, and auto sear, ensuring positive detent engagement and distinct operational tactile clicks at each rotation stop.
As a genuine Colt factory assembly, the C4PSG kit delivers uncompromised dimensioning, heat treatment, and structural integrity required for duty staging and collector restoration projects. Ideal for armorer servicing, NFA transfers, and specialized military clone builds, this kit provides smooth rotational leverage and reliable mechanical fire control staging under hard-use field conditions.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Direct fitment for registered NFA full-auto M16/M4 lower receivers cut with a 4-position selector channel and equipped with compatible 4-position fire control components. (NFA laws apply; non-NFA semi-automatic lower receivers lack the required internal geometry to accept this selector without custom armorer machining).
- Ensure host firearm is completely clear of ammunition, remove upper receiver, and loosen the pistol grip screw to relieve tension on the selector detent spring.
- Slide out the factory selector lever while capturing the lower receiver selector detent pin.
- Apply a thin film of lithium grease to the C4PSG selector barrel journals and detent grooves prior to installation.
- Slide the C4PSG selector into the lower receiver, re-align the detent pin and spring inside the pistol grip channel, and torque the grip screw securely. Function test all four positions on an unloaded lower receiver.
Key Features
- Genuine Colt Factory OEM: Precision-manufactured to strict Mil-Spec tolerances for maximum operational reliability.
- 4-Position Fire Control Execution: Engineered for Safe, Semi-Auto, 3-Round Burst, and Full-Auto firing modes.
- Mil-Spec Manganese Phosphate Finish: Heavy-duty surface treatment resists corrosion, chemical exposure, and friction wear.
- Forged Steel Construction: High-grade steel heat-treated to withstand extreme cyclic rates and physical stress.
- Positive Detent Indexing: Machined detent channels deliver sharp tactile feedback and secure lockup at every position stop.
Product Specifications
- Brand: Colt’s Manufacturing
- Model/Series: M4 Commando Enhanced 4-Position Selector Group
- MPN / SKU: C4PSG
- UPC: N/A
- Platform Fitment: M16 / M4 / Select-Fire Lower Receivers
- Material: Forged Carbon Steel
- Finish/Color: Matte Black Manganese Phosphate
- Country of Origin: United States
