Browning Hi-Power Mainspring Tool

This Browning Hi-Power Mainspring Tool is a professional-grade armorer’s aid engineered to eliminate the frustration of mainspring service on Hi-Power and SA-35 platforms. The factory mainspring assembly is notoriously difficult to disassemble without the correct compression fixture — the spring can bind, the support nut can strip, and the pin can gall the strut. This tool compresses and fully contains the mainspring, allowing clean removal of the support nut and pin from the mainspring strut with controlled, repeatable force. Designed for gunsmiths and serious hobbyists who service these pistols regularly, it reduces cycle time and prevents damage to the strut threads and spring coils.

Compatibility

• Browning Hi-Power (standard and tangent-sight models)
• Springfield Armory SA-35
• Compatible with factory and aftermarket mainspring assemblies using the same strut/nut/pin interface

Key Features

• Precision-machined from steel, manufactured in Peoria, AZ
• Compresses mainspring fully before nut/pin removal — no spring fly-off
• Captive design holds spring under tension during disassembly and reassembly
• Reduces risk of cross-threading the mainspring support nut
• Works with standard bench vises or press fixtures
• Compact enough for portable field use with a hand vise

Install Difficulty

Skill Level: 3/5 — Requires basic mechanical aptitude and a bench vise or heavy-duty hand clamp. No permanent modification to the firearm needed. Expect 5–10 minutes per spring swap after practice. Tools needed: bench vise (or C-clamp), punch set, small hammer, safety glasses.

FAQ

Will this work on an Argentine FM Hi-Power clone?

Yes — the mainspring strut and nut dimensions on FM Hi-Powers match the Browning spec. This tool fits standard 1911/Hi-Power pattern mainspring assemblies.

Do I need to remove the grip or mainspring housing first?

Yes. The mainspring assembly must be removed from the frame before using this tool. The tool does not work in-situ; it is used after the spring/strut assembly is out of the pistol.

Can I use this with a lighter aftermarket mainspring?

Yes. The tool compresses any standard-diameter mainspring (up to ~0.500” coil width) that fits the Hi-Power strut. Lighter springs may require less compression force but still benefit from the captive design.

This tool ships from our warehouse within one business day. Covered by a limited lifetime warranty against manufacturing defects. No returns on used tools — inspect upon receipt.