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Building an AR-15 lower comes down to a pile of tiny springs, detents, and pins that either fit right or drive you crazy. The LANTAC M-SPEC Lower Parts Kit takes the guesswork out of that stage. LANTAC manufactures these components using correct materials, heat treatments, and finishes to meet current military specs, so the takedown pins seat cleanly, the detents don't launch across the room, and everything holds up to real-world use.
The standout here is the ambidextrous safety selector. A lot of parts kits in this price range hand you a single-sided mil-spec safety and call it a day, so having ambi controls baked in is a genuine bonus for lefties, righties who run the gun both ways, and anyone who just wants that flexibility without buying a separate part later.
You get the full spread of lower small parts: takedown pin, pivot pin, two pin detents and two detent springs, the ambi safety selector with its detent and spring, buffer retainer and spring, the complete bolt catch assembly with plunger, spring, and roll pin, plus a magazine catch, spring, and button. LANTAC also throws in a bolt catch set screw sized 6-32 that works with LANTAC, Aero, and other compatible lowers, along with a 1/16th Allen key head to drive it.
One thing to know going in: this kit does not include a fire control group, trigger guard, or pistol grip. That's by design. Plenty of builders are already running an aftermarket drop-in trigger and their own grip, and paying for redundant mil-spec trigger parts is money left on the table. If that's you, this kit covers everything else you need to finish the lower. Every LANTAC part is made in the USA and carries a lifetime warranty, which tells you they stand behind the fit and finish.
No, this kit does not come with a trigger, hammer, disconnector, trigger guard, or pistol grip. It's built for people who are already running an aftermarket drop-in trigger and their own grip, so you're not paying for parts you'll just set aside. It covers all the other small parts needed to finish your AR-15 lower.
Yes, LANTAC includes a full ambidextrous safety selector in this kit, which is a step up from the single-sided safety found in most basic mil-spec kits. It works well for left-handed builders or anyone who runs their controls from both sides. The matching detent and spring are included too.
It's designed to meet current military specifications, so it fits standard mil-spec AR-15 lower receivers. The included bolt catch set screw is a 6-32 that's specifically compatible with LANTAC, Aero, and other similar lowers. If your receiver follows mil-spec dimensions, these parts should drop in without drama.
Yes, every component is manufactured in the USA by LANTAC and backed by a lifetime warranty. The parts use correct materials, heat treatments, and finishes to hold up under regular use. That warranty is a good sign they stand behind the quality.
| UPC | 614347523841 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 01-PKIT-LP |
| Color | Black |
| Length | 3.3500 |
| Model | |
| Product Type | Lower Parts Kit |
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