The SliXprings Main Hammer Spring system is a performance replacement for compatible factory hammer spring assemblies. When properly installed and adjusted, it can support dependable primer ignition, consistent hammer movement, reduced unnecessary spring pressure, and smoother action operation.

The hammer spring must provide enough energy for reliable ignition while remaining correctly aligned throughout the hammer's full range of movement. Insufficient spring pressure can cause ignition problems, while excessive spring pressure can increase operating effort and component wear.

Verify that the SliXprings Main Hammer Spring kit is intended for the exact firearm model before beginning installation.

Firearm dimensions, internal components, spring mounting locations, and hammer geometry can vary between manufacturers, production runs, and previously modified firearms.

Minor fitting or adjustment may occasionally be required. Remove only the minimum amount of material necessary, check alignment and function frequently, and do not alter critical engagement surfaces.

Required parts

• Correct SliXprings Main Hammer Spring kit for the firearm model
• Replacement mounting hardware, if supplied or required

Recommended tools

• Properly fitting gunsmith screwdriver set
• Non-marring punch set
• Small gunsmith hammer
• Bench block or properly padded vise
• Fine polishing stone or abrasive, if fitting is required
• Eye protection
• Clean, well-lit work surface

The preferred adjustment is the lightest spring setting that still provides consistent, dependable ignition and correct hammer operation.

• The hammer should move smoothly throughout its full range
• The spring should remain centered and correctly aligned
• The spring must not twist, buckle, scrape, or bind
• The hammer should remain securely held at each intended cocking position
• The spring must provide sufficient hammer energy for dependable ignition
• All mounting screws and related components must remain secure

Do not reduce spring tension to the point that ignition reliability is compromised. Ammunition primer hardness, firearm condition, internal friction, and previous action work can affect the amount of spring pressure required.

Keep the firearm completely unloaded throughout the initial function test. Do not use live ammunition during installation checks.

• Confirm smooth hammer movement
• Confirm positive cocking and secure sear engagement
• Confirm that the hammer does not follow unexpectedly
• Confirm that the spring remains correctly aligned
• Check for scraping, rubbing, twisting, or binding
• Confirm correct operation of the action and safety mechanisms
• Confirm that all screws and pins remain secure

Stop immediately if the hammer will not remain cocked, the spring moves out of alignment, the action binds, or any safety mechanism fails to operate correctly.

Any live-fire verification should be performed only in a lawful, controlled shooting environment after the firearm has passed all unloaded function checks.

Hammer movement is too heavy

Check for excessive spring pressure, incorrect spring orientation, misalignment, contact with adjacent components, or binding in the hammer and strut assembly.

Hammer spring twists or moves sideways

Confirm that the spring, strut, stirrup, mounting block, and related hardware are properly seated and aligned.

Hammer does not remain cocked

Stop using the firearm. This condition may involve the hammer, sear, trigger, spring alignment, or another action component and should be inspected by a qualified gunsmith.

Ignition is inconsistent

Check spring tension, hammer movement, firing pin condition, firing pin protrusion, ammunition primer type, and other ignition-system components.

Spring contacts the frame or internal components

Verify the kit is correct for the firearm and check spring orientation, mounting position, and component alignment. Do not continue operating the firearm while the spring is binding.

• Always confirm that the firearm is unloaded before beginning work
• Keep live ammunition away from the installation and testing area
• Wear eye protection when removing or installing compressed springs
• Follow the firearm manufacturer's disassembly and reassembly instructions
• Control spring tension during removal and installation
• Do not alter hammer, trigger, or sear engagement surfaces
• Do not use the firearm if the hammer fails to remain securely cocked
• Consult a qualified gunsmith if proper installation, adjustment, or function is uncertain

Proper installation, adjustment, and function testing are essential for safe firearm operation. SliXprings is not responsible for damage or injury resulting from improper installation, unauthorized modification, use in an incompatible firearm, insufficient ignition testing, or failure to follow applicable firearm safety procedures.

A printable version of the SliXprings Main Hammer Spring installation instructions is available in PDF format.

Open Main Hammer Spring Installation Instructions PDF

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