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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Perform a complete unloaded function test before using live ammunition.
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.
Check the affected spring's orientation, contact points, and alignment. Make sure the spring is not pinched, displaced, or binding against another component.
Stop using the shotgun. Check for incorrect spring placement, worn or damaged sear components, debris, misaligned pins, or previous modifications.
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.
Verify that the left and right springs are installed correctly and that neither spring is rubbing, twisted, damaged, or contacting an unintended surface.
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.
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.
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.
A printable version of the SliXprings TTN 1878 Sear Spring Installation Instructions is available in PDF format.
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