Complete Your Build with Precision: The Gen3 Lower Parts Kit
Unlock the full potential of your AR-15 platform with our comprehensive Gen3 Lower Parts Kit. Designed for builders seeking reliability and value, this complete LPK provides every internal component needed to assemble a functional lower receiver. Featuring a mil-spec trigger group, durable springs, and precisely machined pins, this kit ensures a smooth, professional-grade build. Whether you’re a first-time assembler or a seasoned enthusiast, the LPK-GEN3-COMP delivers the essential foundation for a dependable firearm.
| Compatibility | AR-15/M4 Platform (Gen3/Mil-Spec Lower Receivers) |
| Trigger Group | Standard Single-Stage Mil-Spec |
| Hammer & Trigger Pins | Hardened Steel, Precision Machined |
| Fire Control Springs | Music Wire, Heat-Treated for Consistency |
| Bolt Catch & Magazine Release | CNC Machined from 4140 Steel |
| Pivot & Takedown Pins | Detent Included, Anodized Finish |
| Safety Selector | Standard 90-Degree, Ambidextrous Option Not Included |
| Included Components | All Necessary Springs, Detents, and Hardware for a Complete Build |
Is this a complete kit for a lower receiver?
Yes, this is a complete Lower Parts Kit (LPK). It includes every internal component required to assemble a stripped or 80% lower receiver into a functional unit, excluding the pistol grip, stock, and buffer system. You will receive the fire control group, hammer, trigger, disconnector, all associated springs and detents, bolt catch, magazine release, pivot and takedown pins, and safety selector.
Is the trigger included mil-spec?
Absolutely. The kit includes a standard mil-spec single-stage trigger group. This provides a familiar, reliable pull weight and break that is ideal for general-purpose use, training, and building a solid foundation for your rifle. It is manufactured from quality materials to ensure proper function and longevity with standard mil-spec components.
Will this kit fit any AR-15 lower?
This Gen3 kit is designed to fit standard mil-spec AR-15 and M4 pattern lower receivers. It is compatible with the vast majority of commercial lowers on the market. We always recommend verifying your specific lower receiver’s compatibility, especially with non-standard or proprietary designs, but for most builds, this kit will be a perfect fit.
What tools do I need for installation?
Assembling a lower receiver requires specific tools for a smooth and safe build. We recommend a set of roll pin punches and a starter punch, a gunsmithing hammer, needle-nose pliers, and an armorers wrench. A vise and lower receiver vise block are highly recommended to securely hold the receiver during assembly. Proper tools prevent damage to the delicate components and ensure correct installation.
Reviewed by our certified gunsmith team. 15+ years experience.
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