SliXprings TTN 1878 Sear Spring Installation Instructions Follow these step-by-step instructions to install SliXprings TTN 1878 Sear Springs in a compatible TTN 1878 Coach Gun. Proper installation helps provide consistent spring pressure, positive sear engagement, reliable trigger reset, and smooth action operation. Contents Product Overview Compatibility and Fitment Tools Required Installation Steps Function Testing Troubleshooting Safety Information Downloadable Instructions TTN 1878 Sear Spring Overview The SliXprings TTN 1878 Sear Springs are precision replacement springs designed for compatible TTN 1878 Coach Guns. They provide dependable spring pressure for the shotgun's sears and help support consistent trigger reset and positive hammer engagement. Proper sear spring tension is essential to the safe and reliable operation of the fire-control system. Weak, damaged, incorrectly positioned, or binding springs may cause inconsistent trigger operation or unreliable sear engagement. Because individual shotguns can vary due to manufacturing tolerances, wear, or previous action work, inspect all related components carefully during installation. Compatibility and Fitment These instructions are intended for SliXprings sear springs made for compatible TTN 1878 Coach Guns. Before beginning installation, compare the replacement springs with the factory springs and verify that the shape, dimensions, contact points, and mounting locations are appropriate for the shotgun. Shotguns that have received previous action work or fire-control modifications may require additional inspection. Do not force a spring into an incorrect position or alter critical engagement surfaces to make the part fit. Tools Required Properly fitting gunsmith screwdriver set Non-marring punch set Small gunsmith hammer Bench block or properly padded vise Needle-nose pliers, if required Cleaning brush or lint-free cloth Good lighting and magnification Eye protection Installation Steps 1. Verify the Shotgun Is Unloaded Point the shotgun in a safe direction and open the action. Visually and physically inspect both chambers to confirm that they are completely empty. Remove all live ammunition from the work area before beginning disassembly. 2. Disassemble the Action Disassemble the shotgun according to the manufacturer's instructions until the trigger, sear, and spring assemblies are accessible. Keep removed screws, pins, plates, springs, and other components organized so they can be returned to their original locations. 3. Remove the Factory Sear Springs Carefully remove the original sear springs while observing their orientation, mounting positions, and contact points. Control spring tension during removal and wear eye protection to prevent small spring-loaded parts from moving unexpectedly. 4. Clean and Inspect the Components Clean the trigger and sear area to remove dirt, powder residue, dried lubricant, metal fragments, and other debris. Inspect the sears, triggers, hammers, pins, spring contact points, and surrounding action components for wear, damage, bending, corrosion, or previous modification. Replace or repair damaged components before continuing. 5. Install the SliXprings TTN 1878 Sear Springs Position each replacement spring in the same location and orientation as the corresponding factory spring. Make sure each spring leg is properly seated against its intended contact point and that the spring remains centered and stable. Do not force, sharply bend, shorten, grind, or reshape the springs during installation. 6. Check Spring Alignment and Movement Before completing reassembly, carefully operate the sears and triggers through their normal range of movement. Confirm that both springs remain properly seated and that no spring leg is pinched, rubbing against the frame, or contacting an unintended component. The sears and triggers should move freely and return positively without binding. 7. Reassemble the Shotgun Reassemble the shotgun according to the manufacturer's instructions. Confirm that all screws, pins, springs, side plates, and other action components are correctly positioned and securely seated. 8. Perform an Unloaded Function Test Keep the shotgun completely unloaded and pointed in a safe direction during testing. Follow the manufacturer's approved function-check procedure to verify positive sear engagement, smooth trigger movement, proper trigger reset, secure hammer retention, and correct operation of all safety mechanisms. Function Testing Perform a complete unloaded function test before using live ammunition. Confirm that both triggers move smoothly. Confirm that both triggers reset positively. Confirm that both sears engage securely. Confirm that both hammers remain securely cocked. Confirm that neither hammer follows unexpectedly. Confirm that all safety mechanisms operate correctly. Confirm that the action opens and closes normally. Confirm that all springs remain correctly seated. Stop immediately if a trigger does not reset, a hammer does not remain cocked, a sear fails to engage, or any safety mechanism does not operate correctly. Do not return the shotgun to service until the cause has been identified and corrected. Troubleshooting Trigger Does Not Reset Check the affected spring's orientation, contact points, and alignment. Make sure the spring is not pinched, displaced, or binding against another component. Sear Does Not Engage Properly Stop using the shotgun. Check for incorrect spring placement, worn or damaged sear components, debris, misaligned pins, or previous modifications. Hammer Will Not Remain Cocked Do not use the shotgun. This may indicate incorrect assembly, damaged components, inadequate spring contact, or an engagement problem requiring inspection by a qualified gunsmith. Trigger Pull Feels Uneven Verify that the left and right springs are installed correctly and that neither spring is rubbing, twisted, damaged, or contacting an unintended surface. Spring Will Not Remain Seated Confirm that the spring is installed in the correct location and orientation. Inspect the spring contact points and surrounding components for damage, wear, or incorrect assembly. Safety Does Not Function Correctly Stop immediately and do not use the shotgun. Recheck the assembly and have the firearm inspected by a qualified gunsmith before returning it to service. Safety Information Always confirm that both chambers are unloaded before beginning work. Keep live ammunition away from the installation and testing area. Wear eye protection when working with spring-loaded components. Follow the firearm manufacturer's disassembly and function-check instructions. Do not force, shorten, grind, or reshape the springs. Do not alter trigger, hammer, or sear engagement surfaces. Do not use the shotgun if either trigger fails to reset. Do not use the shotgun if either hammer fails to remain securely cocked. Do not use the shotgun if any safety mechanism fails to operate correctly. Consult a qualified gunsmith whenever correct installation or operation is uncertain. Proper installation and function testing are essential for safe firearm operation. SliXprings is not responsible for damage or injury resulting from improper installation, incompatible parts, unauthorized modifications, alteration of engagement surfaces, or failure to follow accepted firearm safety procedures. Download the PDF Instructions A printable version of the SliXprings TTN 1878 Sear Spring Installation Instructions is available in PDF format. Open TTN 1878 Sear Spring Installation Instructions PDF The PDF opens in a new browser tab or window. ← Back to Installation Instructions Back to Top
