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Armaspec® Stealth™ Recoil Spring SRS™ Gen 4 H2 Drop-In Buffer Upgrade – 4.7 oz Equivalent Multi-Stage Captured System – Reduces Felt Recoil & Suppressor Noise – Carbine Buffer Tube Compatible – ARM253-H2
Product Description
The Armaspec® Stealth™ Recoil Spring SRS™ Gen 4 H2 Drop-In Buffer Upgrade (ARM253-H2) represents an elite, high-efficiency mechanical milestone in AR-15 cycling dynamics, acoustic dampening logistics, and structural recoil mitigation, proudly engineered and fabricated in the USA. Designed as a fully self-contained drivetrain optimization module, this advanced component completely overhauls traditional loose spring and buffer formats. While legacy mil-spec buffer setups produce an irritating, metallic "cheese-grater" scratch sound by continually rubbing against the internal raw aluminum walls of the receiver extension—inducing uneven tracking speeds and harsh reciprocal vibrations—the Stealth Recoil Spring utilizes a captured internal guide rod layout. This hyper-engineered upgrade package (810048492701) establishes an indispensable primary asset to smooth out cycling strings, decrease wear on moving components, and stabilize your active shooting plane.
The foundational engineering victory of this Gen 4 captured recoil configuration relies on its proprietary multi-stage mechanical spring configuration paired with a high-density stainless steel H2-equivalent counterweight mass. Precision CNC-machined to strict tolerances, the fourth-generation architecture introduces critical design refinements to completely erase historical mechanical wear areas. Armaspec systematically removed the legacy rubber O-rings along the primary sliding weight to bypass degradation cells, implementing an ultra-robust roll pin cross-lock across the technical polymer base and a custom-machined cap seated permanently over the center steel rod. As your bolt carrier group cycles rearward from gas port expansion, the heavy-duty counterweight moves uniformly down the guide track, compressing the primary spring before smoothly engaging a secondary high-rate spring threshold to absorb sharp, over-gassed muzzle snaps and soften felt recoil pulses.
The real-world tracking victory of this American-built upgrade lies in its complete noise reduction parameters and constant-tension mechanics. Weighing an actual 7.40 ounces of true component mass, the SRS system is precisely calibrated to mimic the exact inertial delay curve of a standard 4.7-ounce tungsten H2 buffer block, ensuring clean, repeatable lock-time parameters. Because the captured baseplate forces the main spring to remain under permanent mechanical tension directly against the rear of the bolt carrier, the system entirely prevents erratic bolt carrier bounce and ensures pristine chambering alignment. Bypassing internal buffer tube contact entirely, this specialized 7.18-inch drop-in system yields absolute structural, mechanical, and acoustic authority over your rifle's lower staging framework.
Includes: (1) Authentic Armaspec Stealth Recoil Spring SRS Gen 4 H2 Assembled Captured System (Polished Center Steel Guide Rod Core, CNC-Machined Heavy Stainless Steel Mass Weight, Dual-Stage High-Tensile Springs, High-Impact Rear Polymer Bumper, Retention Flat Washer), Packed in Original Factory Branded Sealed Protective Retail Cylinder Staging Packaging.
*Administrative Mechanical Staging & Installation Guidance: The Armaspec ARM253-H2 Gen 4 captured system is calibrated specifically for AR-15 rifles utilizing standard, mil-spec carbine-length buffer tubes; it will not properly cycle or clear inside longer rifle-length A2 fixed tubes without a specialized spacer block. The SRS unit is designed out-of-the-box to run with or without a traditional buffer retainer pin and spring; for optimal ease of field maintenance and to extend the service life of the polymer impact head, it is highly recommended to remove the lower receiver's buffer retainer entirely. **CRUCIAL COMPATIBILITY NOTE:** Ensure your specific bolt carrier group features a standard fully open rear cavity profile exceeding 0.60 inches in diameter to allow the internal center guide rod to telescope cleanly during cycling loops. Explicitly verify your host firearm is completely unloaded, cleared, and safe on your workbench before executing lower receiver teardowns.
Key Features
- **Captured Self-Contained Architecture:** Locks your buffer spring and reciprocating mass into a singular modular unit, entirely removing traditional buffer clatter and internal tube friction cells.
- **Multi-Stage Recoil Mitigation:** Dual-spring mechanical configuration absorbs high-velocity bolt impacts in sequential stages to flatten muzzle rise and dramatically soften felt weapon push.
- **Acoustic Signature Suppression:** Slides cleanly down a centered guide rod without making any physical contact with the inner tube walls, silencing the annoying spring twang common to AR platforms.
- **Gen 4 Structural Advancements:** Features an upgraded screw-to-roll-pin cross-axis configuration along the polymer face while deleting old wear-prone weight O-rings for maximum operational lifespan.
- **Constant Face-to-Face Tension:** The spring-loaded baseline weight stays anchored tightly against the bolt carrier at all times to eliminate bolt bounce and secure repeatable chamber seals.
- **Drop-In American Innovation:** Machined, tempered, and hand-assembled natively in the United States to guarantee strict adherence to premium military-grade performance tolerances.
Product Specifications
- **Brand:** Armaspec® (Proudly engineered and warranty-backed natively in the USA)
- **Product Line:** Stealth™ Recoil Spring (SRS) Professional Recoil Mitigation Logistics
- **Model Series Designation:** Stealth Recoil Spring Gen 4 – H2 Heavy Edition
- **SKU / MPN:** ARM253-H2 (Alternative Industry Identifiers: ARM253-H2-G4 / 00810048492701)
- **Buffer Weight Equivalence Class:** H2 Weight Profile (Matches Standard 4.7 oz Heavy Carbine Buffer Systems)
- **Actual Physical Unit Weight:** 7.40 Ounces (209.7 g) True Contained Component Mass
- **Total Guide System Length:** 7.18 Inches (182.3 mm) Optimized Clearance Profile
- **Receiver Tube Compatibility:** Standard Mil-Spec AR-15 Carbine-Length Buffer Extensions
- **Caliber Operational Tuning:** 5.56x45mm NATO, .223 Remington, .300 AAC Blackout, and Select Pistol Caliber Carbines
- **Chassis Main Rod Material:** Hardened High-Yield Structural Steel Core Rod
- **Counterweight Core Construction:** Precision CNC-Machined Heavy Stainless Steel Mass Core
- **Bumper Component Profile:** High-Impact Shock-Absorbing Rear Engineering Polymer Cushion
- **Internal Spring Matrix Class:** Dual High-Tensile Multi-Stage Mechanical Springs
- **Mechanical Retention Architecture:** Roll-Pin Reinforced End Cap with Flat Washer Retainers
- **Product Net Component Weight:** ~0.46 lbs (~7.40 oz) Complete Unit
- **Total Packaging Shipping Mass:** ~0.70 lbs (Enclosed Inside Protective Retail Staging Cylinder Box)
- **UPC Barcode Number:** 810048492701
