- Matte Black Impact and Heat Resistant Polymer Construction with Steel Spring-loaded Detent
- Patented Tool-free Design Quickly Installs Without Having to Remove The Handguard Prior
- Compatible with all .223/5.56 Mil-spec. and Most Billet Upper Receivers
- Manufacturer Part Number: RBT-TKSDC
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Does not fit aero precision m4e1 upper well. Seems like the rod shaped ends do not rotate well in the receiver. Matte finish plastic is not a slick enough surface to allow easy rotation. Or make the opening spring stronger.