An AR-15 carbine length buffer extension spring is a recoil spring designed for use in AR-15 rifles with carbine-length buffer tubes. It helps absorb recoil and ensures reliable cycling of the action. The spring works with AR-15 lower receivers, carbine-length buffer tubes, carbine buffers, stocks (collapsible), upper receivers, and bolt carrier groups. It’s essential for proper function and smooth operation in AR-15 builds using carbine-length buffer systems, making it ideal for tactical, sporting, or home defense rifles.
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