Color filling an AR-15 stripped lower receiver refers to the process of filling the engraved markings on the receiver with colored paint, epoxy, or other substances. This is done to enhance the visibility and aesthetic appeal of the markings.To color fill a stripped lower receiver, you would typically follow these steps:

1. Prepare the receiver: Clean the receiver thoroughly to remove any dirt, oil, or debris that could affect the adhesion of the color filling material.
2. Select the color filling material: Choose a paint or epoxy that is suitable for the material of your receiver and desired color. Acrylic paint, enamel paint, or two-part epoxy are commonly used options.
3. Apply the color filling material: Using a small brush or applicator, carefully apply the color filling material to the engraved markings on the receiver. Take care to fill the engravings completely while avoiding excess spillage onto the surrounding areas.
4. Remove excess material: After filling the markings, gently wipe away any excess color filling material from the receiver’s surface using a clean cloth or sponge. Be cautious not to remove the color from the engraved areas.
5. Allow to dry or cure: Follow the instructions provided by the manufacturer of the color filling material regarding the drying or curing time. It is important to give the material adequate time to set properly.
6. Optional finishing touches: Once the color filling material is dry or cured, you may choose to apply a protective coating or clear finish to the entire receiver to provide additional durability and safeguard the color-filled markings.

Remember to comply with all applicable laws and regulations when modifying the appearance of firearms. Additionally, it’s always a good idea to consult with professionals or reference reputable sources for guidance on performing modifications to firearms and follow proper safety precautions throughout the process.