When you demand more from your AR-15 build, the SLA502S VPRS-15 Variable-Pitch Recoil Spring by Spikes Tactical delivers. Designed in collaboration with the experts at Cook Spring Co., this innovative buffer spring uses variable pitch coil spacing to reduce felt recoil and smooth out the rifle’s cycling action. Compatible with carbine and pistol-length buffer tubes, this spring is ideal for multiple builds including 5.56/.223, 9mm blowbacks, and .300 BLK systems.
Key Features & Benefits
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Variable-Pitch Spring Technology: The SLA502S’s progressive coil spacing acts as a mechanical cushion, breaking up the initial bolt carrier impact and slowing the carrier down more smoothly.
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One Size, Broad Use: Works across calibers—9mm blowback, .300 BLK and standard carbine AR-15 systems—eliminates the guess-work of matching spring weights.
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Precision Made in the USA: Manufactured by Spikes Tactical in Florida, built with American materials and backed by their lifetime warranty.
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Drop-in Upgrade Simplicity: Replace your standard buffer spring with the SLA502S and retain your existing buffer tube. No complex tuning required.
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Improved Follow-Up Shots & Reduced Sight Bounce: By smoothing the carrier return, the SLA502S helps your rifle track better and recover faster for precise follow-up engagements.
Ideal For
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AR-15 builders looking for smoother recoil impulse
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Tactical platforms where consistent and reliable cycling is critical
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Pistol- caliber ARs and blowback systems desiring one universal spring
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Custom rifle builds and those upgrading from mil-spec springs to premium accessories
Technical Specifications (based on available data)
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Material: High-quality steel coil (variable pitch)
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Compatibility: Standard AR-15 carbine or pistol buffer tube systems, including 9mm and .300 BLK setups
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Manufacturer: Spikes Tactical (Apopka, Florida)
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Warranty: Lifetime warranty on manufacturing defects (per Spikes Tactical)
Why Choose the SLA502S Over Standard Springs?
Standard single-pitch buffer springs are designed for a fixed recoil impulse and may feel harsh or allow excess carrier bounce in high-rate-of-fire or non-5.56 systems. The SLA502S’s variable-pitch design cushions the impact, slows the carrier more predictably, and offers improved consistency across builds. If you’re chasing smoother function, faster follow-ups, and a premium feel — this spring stands above common replacements.
Installation & Usage Tips
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Always ensure your rifle is unloaded and clear before installing.
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Remove the standard buffer spring and buffer from your buffer tube.
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Install the SLA502S spring in the same orientation as your prior spring.
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Replace the buffer if you’re using the matching kit variant (SLA502S-K) which may include the T-2 buffer.
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After installation, function-check the rifle and verify smooth cycling and proper bolt return before live-fire.
Legal & Shipping Notes
Please note that the SLA502S is a recoil spring component and does not constitute a firearm or trigger any special regulatory status by itself. Buyers are still responsible for compliance with local, state, and federal laws governing AR-platform components and builds. Some shipping restrictions may apply—check our shipping policy for your state.
