The Spike's Tactical ST-T3 heavy buffer is a purpose-built recoil management system for AR-platform rifles that demand serious control—especially in suppressed setups, rapid-fire scenarios, or guns running hot. Unlike lighter buffers that let reciprocating mass hammer your stock tube, this multi-caliber design combines machined aluminum construction with ultra-dense tungsten bar stock internals (5.4 oz.) to absorb felt recoil, minimize bolt bounce, and keep your shots in the fight when speed and precision matter.

The ST-T3 is the heaviest in Spike's three-weight lineup, engineered specifically for shooters who need maximum energy absorption. Whether you're running a suppressor (which inherently increases backpressure and bolt velocity), pushing full-auto fire, or working with an overgassed rifle, this buffer's aggressive tungsten mass cycles slower, reduces carrier whip, and helps you stay on target through extended strings of fire. The hard-anodized aluminum body resists wear and corrosion, while the mil-spec polyurethane bumper absorbs impact from the bolt carrier without degrading. Works with any M4-type adjustable stock on .223/5.56 and other AR-platform calibers.

Spike's reputation for precision machining shows here—every detail matters when you're tuning a system for reliability and controllability. If you're building a suppressed rifle, SBR, or running a gassed-up upper, the ST-T3 gives you tuning authority that factory buffers simply don't offer.

Key Features

• Ultra-dense tungsten bar stock (5.4 oz.) for maximum recoil reduction and bolt bounce control
• Hard-anodized aluminum body for durability and corrosion resistance
• Mil-spec polyurethane bumper resists impact wear
• Multi-caliber compatible with AR-platform rifles
• Works with M4-type adjustable stocks
• Aggressive recoil management ideal for suppressed rifles and rapid-fire operation

Specifications

Weight	5.4 oz.
Material	Machined Aluminum / Tungsten Bar Stock
Finish	Hard-Anodized Black
Buffer Type	ST-T3 (Heaviest)
Compatibility	M4-Type Adjustable Stock, Multi-Caliber AR-Platform
Bumper	Mil-Spec Polyurethane

Frequently Asked Questions

What's the difference between the ST-T1, ST-T2, and ST-T3 buffers?

They're tuned for different recoil profiles. The ST-T1 (3 oz.) uses low-density tungsten powder for standard recoil control and smoother cycling; the ST-T2 (4.1 oz.) uses high-density tungsten powder for heavier recoil reduction and slower cycling; the ST-T3 (5.4 oz.) uses ultra-dense tungsten bar stock and delivers the most aggressive recoil suppression—best for suppressed rifles, full-auto, or overgassed setups.

Will the ST-T3 work with my AR-15 or .308 platform rifle?

The ST-T3 is designed as a multi-caliber buffer for AR-platform rifles and works with any M4-type adjustable stock. Confirm your upper and stock are standard AR configuration before purchasing.

Is the ST-T3 ideal for a suppressed rifle?

Yes. Suppressors increase backpressure and bolt carrier velocity, which can lead to excess recoil and bolt bounce. The ST-T3's 5.4 oz. tungsten mass is engineered specifically to manage these conditions and improve controllability in suppressed setups.

What's included?

You receive the ST-T3 buffer itself. It's compatible with standard mil-spec buffer tubes and M4-type adjustable stocks.