B&T USA Replacement Hammer Spring - Factory OEM Fire Control Component, High-Tensile Spring Steel, Natural Metallic Finish - BT-36249
Product Description
Maintaining the crisp ignition timing and hard primer strikes of a premium submachine gun or pistol-caliber carbine requires internal fire control components calibrated to exact factory specifications. Weakened or worn hammer springs drop your kinetic impact energy over time, resulting in erratic ignition timing, failure-to-fire faults, and light primer indentation failures on the staging bench. The **B&T USA® Replacement Hammer Spring (BT-36249)** completely flatlines this diagnostic bottleneck, delivering an authenticated, Swiss-engineered factory replacement spring built to restore hard, military-grade primer strikes.
Proudly engineered to professional defense parameters by Brügger & Thomet, this heavy-duty torsion component is precision-wound from **high-memory structural spring steel wire**. The spring core undergoes a controlled hardening process to survive rapid-fire cycling vibrations and constant compression storage without taking a structural set. Configured with dual high-tension coil wraps that sit over the factory hammer pin hub, its robust extended wire legs exert consistent forward inertia against the hammer block, guaranteeing clean primer strikes even when running tough military surplus ammunition types.
Engineered to slide natively into the internal receiver channels of your fire control housing, this turn-key armorer component ensures fast lock times and absolute ignition reliability right from your workbench.
*Armorer Bench Notes & Real-World Receiver Staging Guidance: The B&T BT-36249 component package arrives workspace ready as a single replacement dual-coil hammer torsion spring. PROPRIETARY INTERNAL FIRE CONTROL INTERFACE MATRIX: This internal high-tension spring is engineered natively, strictly, and cross-compatibly to wrap over **standard B&T factory hammer sleeves and retention hubs**. *Platform FitMENT Checklist:* It serves as an identical, direct-replacement mechanical spring across the **B&T APC9/45, APC223/300/308, GHM9, TP9, and SPC9 series polymer or aluminum lower receivers** on your bench. System Tuning Notice: This is a standard duty-weight factory replacement spring calibrated to ensure absolute ignition energy. It is not an aftermarket lightened match modification. Armorer Workbench Custom Staging Sequence: 1. Visually and physically confirm your host firearm platform is completely clear of live ammunition, the magazine is removed, and the chamber is safe. 2. Field strip the weapon to separate the lower receiver housing completely from the upper receiver assembly. 3. Securely capture the hammer and pull the trigger, riding the hammer forward slowly to bleed off raw spring pressure in a controlled manner. 4. Use a standard 5/32" drift punch tool to push the main hammer axis pin out of the receiver side walls. 5. Remove the hammer body from the chassis pocket, paying attention to the directional orientation of the old spring legs. 6. Slide the new BT-36249 hammer spring over the hammer hub, ensuring the center loop bridge hooks behind the hammer spine and the dual legs extend rearward toward the trigger floor. 7. Reinsert the hammer, compress the spring legs downward to align the axis pin channels, push the retention pin fully home, and test mechanical ignition and lockup before final assembly downrange.*
Key Features
- Genuine Swiss B&T OEM: Sourced directly from B&T assembly lines to guarantee authentic geometric dimensions, precise spring rates, and strict factory compliance.
- High-Memory Tension Wire: Precision-coiled from premium high-tensile spring steel alloy to resist mechanical compression set and tension loss over heavy duty cycles.
- Hard Strike Calibration: Delivers the exact factory-rated forward energy required to ensure positive ignition with heavy military primer cups, eliminating light strike failures.
- Symmetrical Dual-Coil Geometry: Engineered with a balanced double-torsion coil loop layout that spreads stress evenly across the hammer pin to stop pin bend variables.
- Universal B&T Sub-Gun Fitment: Engineered to drop cleanly into a wide variety of B&T firearms, simplifying small-parts maintenance across your entire weapon inventory.
- Critical Small Parts Spare: A mandatory, low-cost component for your armorer workbench parts tray to quickly resolve weak primer strike diagnostics right at the bench.
Product Specifications
- Brand: B&T USA® / Brügger & Thomet (Thun, Switzerland / Tampa, FL)
- Model Line: High-Performance Factory OEM Lower Receiver Replacement Components
- MPN/SKU Code: BT-36249 (Factory Reference Internal Hammer Spring Index Position SKU)
- UPC Code Profile: 840225700916
- Fire Control Group Fitment Match: B&T Factory Semi-Automatic and Selective-Fire Hammer Block Hubs
- Pistol/Rifle Family Tracking: APC9, APC45, APC223, GHM9, TP9, SPC9 Series Lower Receivers
- Component Functional Class: Fire Control Group High-Tension Double-Torsion Spring for Hammer Drive
- Structural Material Base: Premium High-Tensile Heat-Treated Structural Carbon Spring Steel Wire
- Exterior Finish Dressing: Natural Clean Metal Coating with Protective Anti-Friction Oil Film
- Co-Dependent Hardware Interface: Fits Directly over B&T OEM Hammer Hub Sleeves and 5/32" Axis Pins
- Full Kit Component Checklist: 1x Factory-Wound High-Memory Replacement Hammer Torsion Spring Only
- Packaging Format Class: Factory Poly Bag Presentation Pack with B&T Parts Authenticity Label Tags
- Product Type Category: Rifle/Pistol Components / Fire Control Group Parts & Spring Spares
- Spring Configurations Profile: Balanced Double-Coil Bridge Connector Torsion Spring Profiling
- Net Component Module Mass: ~0.14 Ounces (~3.9 Grams Lightweight Industrial Core Metal Weight)
- Global Quality Certifications: Built strictly to NATO Military Specification and Swiss Duty Standards
- Warranty Tracking Protection: Fully Backed by B&T USA Factory Material Defect Coverage
