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The hammer spring is one of those parts nobody thinks about until it starts causing trouble. It powers the hammer through every trigger cycle, and when it wears out or weakens, you start seeing light primer strikes and failures to fire. This 20-pack from LBE Unlimited gives you a solid supply of replacements so you're never scrambling when a spring finally gives up. Each one is made from 17-7 stainless steel and manufactured right here in the USA.
There's a reason 17-7 stainless keeps showing up in firearm springs. It's a precipitation-hardening steel with high strength, excellent fatigue resistance, and solid corrosion resistance, which means these springs hold their tension through thousands of cycles without going soft. That last part matters inside an AR lower, where a spring lives under constant load and needs to deliver consistent hammer-fall energy round after round. Springs like these are commonly rated to handle repeated stress and elevated temperatures better than cheaper stainless grades.
Most AR builders and armorers treat springs as cheap insurance, and for good reason. General guidance is to swap fire control springs somewhere in the 5,000 to 10,000 round range, or sooner if you notice light primer strikes or reliability hiccups that aren't ammo-related. Having twenty on hand covers a lot of builds, a lot of repairs, and plenty of range bag spares. If you keep a hammer cocked for long stretches, a fresh spring is worth keeping close.
Installation is straightforward for anyone comfortable working in an AR lower. The spring's legs seat on top of the trigger pin and the coils wrap around the hammer pin, powering the hammer forward when the sear releases. Whether you're finishing a new build, restocking a shop, or refreshing a rifle that's seen serious use, this pack keeps a critical little part off your worry list.
The hammer spring powers the hammer forward when the trigger releases the sear, driving it into the firing pin to ignite the primer. It's what delivers the strike force needed to set off both military and commercial primers. A weak or worn spring is one of the most common causes of light primer strikes and failures to fire.
A common rule of thumb is to swap fire control springs every 5,000 to 10,000 rounds as part of routine maintenance. You'll also want to replace it sooner if you start noticing light primer strikes or misfires that aren't caused by the ammo. Since you get twenty in this pack, you'll have plenty on hand for both scheduled maintenance and surprises.
17-7 is a precipitation-hardening stainless steel known for high strength, strong fatigue resistance, and good corrosion resistance. Those qualities let the spring hold its tension through heavy cycling and resist rust inside the lower receiver. It's one of the most widely used materials for quality firearm springs for exactly these reasons.
These are standard AR-15 hammer springs and drop into mil-spec fire control groups in AR-15 pattern lowers. The legs seat on top of the trigger pin and the coils wrap around the hammer pin. Installation is simple for anyone comfortable working inside an AR lower.
| UPC | 706612407465 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | ARHS20PK |
| Color | Silver |
| Model | |
| Product Type | Spring |
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