Geissele Lpk Standard

The Geissele LPK Standard is a complete lower parts kit engineered to get your AR-15 lower receiver into operation without forcing you to buy components you'll swap out anyway. Geissele Automatics built their reputation on precision manufacturing and exacting standards, and this kit reflects that same attention to detail. Every part is manufactured to mil-spec (M16/M4) dimensions, ensuring reliable fit and function across AR-15 and carbine platforms. What sets this lower parts kit apart is what it doesn't include: the trigger and pistol grip. Geissele leaves those critical, highly personal components for you to choose, so you're not paying for parts destined for the bin.

If you're building a custom AR or completing a lower receiver, this kit handles all the mechanical and retention hardware you need. You get the bolt catch assembly, magazine release components, safety selector, buffer retainer, takedown system, and trigger guard—17 parts total that work together to make your lower functional and reliable. Since the fire control group and grip are your call, you can spec exactly the trigger break and ergonomics that match your shooting style and mission.

Geissele's mil-spec construction means no surprises during assembly or years of shooting afterward. This is workhorse hardware designed for serious builders who know what they want in their trigger and grip and refuse to compromise on the supporting parts.

Key Features

• 17-piece lower parts kit; excludes trigger and pistol grip
• Mil-spec (M16/M4) dimensions for optimized AR-15 fit and function
• Includes bolt catch assembly, magazine release system, safety selector, buffer retainer, and takedown components
• Precision manufactured to Geissele's exacting standards
• Lets you source your own fire control group and grip for a fully custom build

Frequently Asked Questions

What's included in the Geissele LPK Standard?

The kit contains 17 parts: bolt catch, bolt catch plunger, spring and roll pin, magazine release button and spring, magazine release, buffer retainer spring, safety, buffer retainer, safety detent and spring, trigger guard with roll pin, takedown pins, and takedown detents with springs. It does not include the trigger, hammer, disconnector, or pistol grip.

Will this lower parts kit work with my AR-15?

Yes. Geissele manufactures to mil-spec (M16/M4) dimensions, so these parts are built to fit and function in standard AR-15 and carbine lower receivers.

Why doesn't this kit come with a trigger and grip?

Geissele omits the trigger, hammer, disconnector, and pistol grip because these are the most personal components of an AR build. Most builders and custom shops prefer to select their own fire control group and ergonomics rather than replace parts they didn't choose in the first place.

Is this suitable for a beginner AR builder?

Yes, provided you're prepared to source a trigger group (trigger, hammer, disconnector) and pistol grip separately. All other lower assembly components are included and manufactured to mil-spec standards for reliable installation.