|  Matrix Steel Receiver Pin Set for M4 / M16 Series Airsoft AEG Application: Replace those weak Aluminum pins with this Heavy Duty Steel Receiver Pin Set Compatibility: For Tokyo Marui, Matrix, G&G, JG, Echo1 and other similar M4 / M16 Series Airsoft AEG Rifles Material: Steel Alloy Manufacturer: Matrix Note: Some modification to the receiver may required.
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