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Building an AR lower and want components that outlast the rest of the rifle? The Spikes Tactical SLPK301 Enhanced Lower Parts Kit was put together for folks who care about longevity and don't want to fuss with cheap parts down the road. It swaps the usual gritty mil-spec pieces for genuine upgrades while still bolting into any standard AR-15 lower receiver, so it drops right into your build with no surprises.
The heart of this kit is the ST Battle Trigger, a single-stage group with a rounded hammer and disconnector all plated in Nickel Boron. That coating gives the trigger a naturally slick surface, so the pull comes out smooth and crisp and tends to break somewhere in the 5 to 6 pound range for most builds. It's not marketed as a featherweight competition trigger, but the break is clean with minimal creep, and it genuinely smooths out the more rounds you send. The rounded hammer also plays nice across calibers, which is handy if you're building anything beyond a straight 5.56.
Spikes holds the fire control group in place with KNS Gen II Mod II anti-rotation pins. These keep the hammer and trigger pins from walking out over time, a real headache on 9mm ARs and hard-use guns, and they stop the pin holes from egging out after years of shooting. You also get an ambidextrous safety selector, a Spikes billet tool-less trigger guard with a set screw, and a black Ergo grip stamped with the Spike's spider logo.
Beyond the headline upgrades, this is a complete kit. It rounds out with a mil-spec bolt catch and its spring, roll pin and plunger, the magazine catch, spring and button, front pivot and rear takedown pins with detents and springs, the buffer retainer spring and plunger, plus the grip screw and star washer. Made in the USA and backed by a Spikes Tactical lifetime warranty, it's a solid one-box answer for finishing a lower right the first time.
Yes, this kit is built to install in standard mil-spec AR-15 lower receivers, so it drops into the vast majority of stripped lowers on the market. The rounded hammer on the Battle Trigger also lets it work across multiple calibers, not just 5.56. If your lower follows standard AR-15 dimensions, you're good to go.
Most builds land right around 5 to 6 pounds, though there's some variance depending on individual springs. It's a single-stage pull with a clean break and very little creep, and the Nickel Boron plating means it smooths out even more as you put rounds through it. It's not an ultra-light competition trigger, but it's a big step up from a gritty standard mil-spec unit.
The KNS Gen II Mod II pins lock the hammer and trigger pins so they can't walk out during use, which is a known issue on 9mm ARs and hard-use rifles. They also keep the pin holes from wearing oval or egg-shaped over years of shooting. It's one of the main reasons this kit holds up longer than a basic parts kit.
It's a complete kit for finishing a lower. Along with the fire control group and upgraded parts, you get the bolt catch, magazine catch, takedown and pivot pins, detents, springs, buffer retainer, and grip hardware. The only things you'll supply separately are the stock, buffer tube assembly, and of course the lower receiver itself.
| UPC | 855319005440 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | SLPK301 |
| Color | Black |
| Model | |
| Product Type | Lower Parts Kit |
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