Browning Arms Co. Magazine Spring Strut, Inner – OEM Replacement Part – B3578187
Keep your Browning rifle feeding smoothly and reliably with the Browning Arms Co. Magazine Spring Strut, Inner – Part #B3578187. This genuine Browning factory component is engineered to restore proper magazine tension and consistent feeding in Browning A-Bolt, A-Bolt II, and BBR rifles, making it an ideal replacement for worn, bent, or damaged internal magazine parts. Midwest Gun Works+2gunpartscorp.com+2
Whether you’re maintaining a trusted hunting rifle or refurbishing a classic bolt gun, this OEM magazine spring strut, inner helps ensure your rifle performs the way Browning intended.
OEM Browning Quality for Reliable Feeding
The Magazine Spring Strut, Inner (B3578187) is a factory original Browning part, not an aftermarket copy. That means it’s built to the exact dimensions, tolerances, and materials specified by Browning’s engineers. Midwest Gun Works+1
Designed specifically for Browning A-Bolt, A-Bolt II, and BBR rifles
Ensures proper alignment and support for the magazine spring and follower
Helps maintain smooth, consistent cartridge feeding from the magazine into the chamber
Using genuine Browning parts helps preserve the reliability, safety, and resale value of your rifle—especially important on firearms that may see hard use in the field or be passed down to the next generation.
What the Inner Magazine Spring Strut Does
Inside the detachable or internal box magazine, this inner spring strut works in conjunction with the outer magazine strut and the magazine spring to keep the follower under proper tension. Midwest Gun Works+1
Its key functions include:
Providing structural support for the magazine spring
Helping maintain even, linear pressure on the follower as cartridges are fed
Contributing to reliable cartridge presentation to the feed ramp and bolt face
When this part becomes worn, bent, or damaged, you may notice feeding issues such as nose-dives, inconsistent last-round feeding, or sluggish follower movement. Replacing it with a new Browning B3578187 inner strut is a simple and cost-effective way to correct those problems.
Wide Caliber Compatibility Across the A-Bolt Platform
Browning designed this inner magazine spring strut to work across a broad range of A-Bolt and A-Bolt II calibers, from light varmint rounds to powerful magnum hunting cartridges. Dealers list compatibility with popular chamberings such as .223 Rem, .243 Win, 6.5 Creedmoor, .308 Win, plus multiple WSM and magnum options. Midwest Gun Works+2MidwayUSA+2
Typical compatible platforms include:
Always verify compatibility with your specific rifle and caliber using your owner’s manual or a trusted parts diagram before ordering or installing.
Durable Steel Construction with Matte Blued Finish
The Browning Magazine Spring Strut, Inner B3578187 is manufactured from quality steel and finished in a matte blued coating. Midwest Gun Works+1
Benefits of this construction include:
Strength and rigidity to support the magazine spring over thousands of cycles
Excellent wear resistance against repeated compression and movement
Corrosion resistance thanks to the protective blued finish
A low-glare, traditional look that matches the rest of your Browning rifle’s internals
This is a small but critical part that sees constant movement and pressure; using a hardened, blued steel strut helps extend the service life of your magazine assembly.
Ideal for Maintenance, Repairs, and Restorations
The Browning B3578187 inner magazine spring strut is a smart choice for:
Replacing a worn, broken, or bent original part
Bringing older A-Bolt, A-Bolt II, or BBR rifles back to factory function
Preventive maintenance on heavily used hunting rifles
Gunsmiths and armorers who maintain fleets of Browning bolt guns
If your magazine follower feels “mushy,” doesn’t rise smoothly, or you’re experiencing intermittent feeding issues, this part can be a key element in restoring proper operation when combined with a fresh magazine spring and follower inspection.
Simple, No-Hazard Component
Unlike ammunition or complete magazines, the Magazine Spring Strut, Inner is a non-serialized, non-hazardous firearm component, making it: Shooting Surplus+1
That said, any work on the magazine or action of a firearm should be done carefully, following Browning’s instructions and safety procedures.
Installation & Safety Recommendations
While many experienced shooters are comfortable replacing small internal parts, Browning and parts distributors recommend that: AmmoSouth+1
Installation be performed by a qualified gunsmith if you’re not familiar with your rifle’s magazine design
The rifle be unloaded and double-checked safe before any disassembly
All components—spring, follower, inner and outer struts—be inspected for wear during service
Proper installation ensures the new B3578187 inner spring strut works in harmony with the rest of the magazine components for safe, reliable operation.
Key Features – Browning Magazine Spring Strut, Inner B3578187
Why Choose the Browning B3578187 Magazine Spring Strut, Inner?
If you rely on your Browning bolt-action rifle for serious hunting, precision shooting, or treasured family use, keeping the magazine system in top condition is essential. The Browning Arms Co. Magazine Spring Strut, Inner B3578187 offers:
Genuine OEM fit and function
Proven compatibility with A-Bolt, A-Bolt II, and BBR platforms
Durable steel construction with a protective matte blued finish
A straightforward way to restore smooth, reliable feeding to your rifle’s magazine
For shooters who value Browning’s reputation for quality and want to keep their rifle performing at its best, this inner magazine spring strut is a small part that delivers a big impact on overall reliability.
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