Bolt Catch Spring

The bolt catch spring is a critical component in ensuring the proper functioning of your firearm's bolt catch mechanism. If the bolt catch is not working correctly, it can lead to issues with the bolt holding open after the last round is fired. Follow this step-by-step guide to troubleshoot and resolve common problems related to the bolt catch spring.

Steps to Troubleshoot Bolt Catch Spring Issues

1. Verify Bolt Catch Spring Installation

• Disassemble the Lower Receiver: Remove the upper receiver to access the bolt catch mechanism.
• Inspect the Spring Installation: Ensure the bolt catch spring is correctly installed in the bolt catch slot. The spring should be seated properly and not kinked or damaged.

2. Check for Debris or Obstructions

• Clean the Bolt Catch Slot: Use a small brush or compressed air to clean the bolt catch slot. Remove any dirt, debris, or residue that may be obstructing the spring or bolt catch.
• Inspect for Damage: Check the bolt catch slot for any signs of damage or wear that could affect the movement of the bolt catch.

3. Ensure Proper Tension of the Bolt Catch Spring

• Test Spring Tension: Press on the bolt catch to check the tension of the spring. It should provide firm resistance. If the spring feels weak or does not return the bolt catch to its original position, it may need to be replaced.
• Replace the Spring if Necessary: If the bolt catch spring is weak or damaged, replace it with a new one. Ensure the new spring is correctly installed and provides adequate tension.

4. Inspect the Bolt Catch Itself

• Examine the Bolt Catch: Inspect the bolt catch for any signs of damage, wear, or deformation. Ensure the catch moves freely and is not obstructed.
• Replace the Bolt Catch if Necessary: If the bolt catch is damaged or excessively worn, replace it with a new one to ensure proper function.

5. Verify Buffer and Buffer Spring Compatibility

• Check Buffer and Spring: Ensure you are using the recommended buffer weight and buffer spring for your specific setup. Refer to our Buffer and Buffer Spring Recommendations for guidance.
• Test with Different Components: If you are experiencing issues, try using different buffers and buffer springs to see if it resolves the problem.

Angstadt Arms Lightened Bolt Catch Spring

If your firearm includes our lightened bolt catch spring, ensure it is correctly installed. This spring comes preinstalled with our complete firearms and is included in the small bag inside the receiver box when purchasing lower receivers or receiver sets.

1. Check the Cycling Distance

   • Manually lock the bolt to the rear and leave the charging handle extended.
   • Pull the charging handle rearward until it stops and measure the distance traveled. It should be roughly a minimum of 1/4". If it's less, the Bolt Carrier Group (BCG) may not be traveling far enough to activate the LRBHO.

2. Manual Test with Empty Magazine

   • Charge the gun manually with an empty OEM Glock magazine and check if the bolt holds open.

3. Inspect Bolt Catch Function without Upper Receiver

   • Remove the upper receiver, insert an empty OEM Glock magazine, and check if the bolt catch lifts completely up.

4. Cleaning Bolt Catch Spring & Detent

   • Refer to our detailed cleaning instructions for the bolt catch spring and detent to ensure there are no obstructions or issues causing the malfunction.

5. Bolt Catch Movement

   • Note that the bolt catch on our firearms may feel looser than a standard AR-15 bolt catch. This is normal and designed to function correctly with our system.

General Maintenance Tips

• Keep Your Firearm Clean and Lubricated
  • Regular maintenance ensures reliable operation. Ensure all moving parts are clean and properly lubricated.
• Consistent Issue Verification
  • Make sure the problem is not specific to a certain brand, type, or lot of ammunition. Identifying consistent patterns can help pinpoint the source of the problem.

By following these steps and performing regular maintenance, you can ensure your bolt catch spring functions correctly, contributing to the overall reliability of your firearm. Regular inspections and proper care will help prevent and resolve most issues.

Happy shooting!