Buffer Spring

Spring Types

Standard Carbine Spring: The mil-spec option, typically made from music wire. Works well for most applications but can produce the characteristic "twang" sound during cycling.

Rifle-Length Spring: Longer spring for rifle-length buffer tubes. Not interchangeable with carbine systems.

Flat Wire Springs: Made from flat cross-section wire that provides more consistent force throughout compression. Reduces felt recoil and eliminates the spring noise. Popular upgrade from companies like Tubb's and Sprinco.

Captured/Enclosed Springs: Spring contained within the buffer body. Eliminates noise and simplifies maintenance but limits buffer weight options.

Spring Rates

Standard: Works with standard buffers for most 5.56 builds.

Enhanced/Heavy: Increased spring rate for use with heavier buffers, suppressed rifles, or overgassed systems. Slows down the bolt carrier for smoother cycling.

Lightweight: Reduced spring rate for undergassed systems, pistol caliber builds, or .22 LR conversions.

Replacement Intervals

Springs lose tension over time with use. Most manufacturers recommend replacing buffer springs every 5,000-10,000 rounds, though quality springs can last longer. Signs of a worn spring include short-stroking, failure to lock back on empty, or inconsistent ejection patterns.

Selection Guidelines

For a standard 16" 5.56 build with a carbine buffer, a mil-spec spring works fine. If you're running a suppressor, consider an enhanced spring to slow the increased cyclic rate. Flat wire springs are excellent upgrades that reduce noise and improve feel for a modest investment.