.308 80% Lower and LR-308/AR-10 Lower Parts Kit (w/ Hammer and Trigger)
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About this product
The .308 80% Lower and LR-308/AR-10 Lower Parts Kit is a complete starting point requiring no FFL paperwork to build an unserialized .308 or 6.5 Creedmoor battle rifle. This combination provides a precision-milled 80% lower receiver paired with every small part needed for final assembly, creating a direct-to-door solution for experienced builders. By bypassing serialization requirements, it offers a path to firearm ownership that prioritizes builder control and component-level privacy.
What is the .308 80% Lower and LR-308/AR-10 Lower Parts Kit used for?
This kit is used to complete the legal construction of an unserialized DPMS Gen 1 pattern rifle in .308 Winchester or 6.5 Creedmoor. Builders machine the 80% lower's fire-control pocket using a compatible jig like the 80% .308 Easy Jig® Gen 1, then install the included lower parts kit to create a functional receiver assembly. The primary applications are precision DMR builds and high-reliability carbines where component selection and builder oversight are critical.
How does the .308 80% Lower and LR-308/AR-10 Lower Parts Kit compare to the 308 80% Lower – Billet?
This complete kit differs from the standalone 308 80% Lower – Billet by including all necessary internal components, while the billet option is a receiver-only purchase. The standalone billet lower offers choice in parts selection but requires separate procurement of trigger, pins, and springs—adding approximately $45-$85 and 7-10 shipping days from secondary vendors. This complete kit saves time and consolidates shipping, making it the better choice for builders seeking an immediate start-to-finish solution.
What does it weigh and what are the dimensions?
The unfinished 80% lower blank measures 9.8 inches in length, 2.6 inches in width at its widest point, and 1.5 inches in height at the buffer tube interface. In its raw forged 7075-T6 form, the un-machined blank weighs 1.4 pounds (634 grams), while the billet 6061-T6 option weighs 1.2 pounds (544 grams) due to less dense material. These dimensions ensure compatibility with all standard DPMS-pattern upper receivers and buffer systems when final machining is completed to proper depth specifications.
Who is this NOT for?
This kit is not for first-time builders or anyone unwilling to perform precise machining operations. The fire-control pocket requires milling to a depth of 0.860 inches with a tolerance of ±0.003 inches using a 5/16" High Speed End Mill in a dedicated jig. Builders lacking access to a drill press, router, or milling fixture, or those unfamiliar with proper thread measurement protocols, should begin with a fully serialized receiver to avoid material waste and legal complications.
What's in the box?
The box contains one 80% lower receiver blank (forged 7075-T6 or billet 6061-T6 depending on selection), and one complete LR-308 lower parts kit including: a polished hammer with measured 3.5-4.5 lb trigger pull, anti-walk trigger and hammer pins, all springs and detents for bolt catch, magazine release, and safety selector, and one pivot pin and takedown pin set. Notably, it includes a 0.154-inch diameter safety selector detent and spring, saving builders from sourcing this commonly overlooked component separately.
Is the .308 80% Lower and LR-308/AR-10 Lower Parts Kit worth it at $149.99?
At $149.99, this kit represents a 12-18% cost consolidation compared to purchasing the lower and parts kit separately from typical vendors. When accounting for the average $12-18 shipping fee for parts kits ordered alone, this bundled approach delivers an effective savings of $25-35 for builders ready to begin machining immediately. For builders who value time consolidation and vendor reliability over absolute component-by-component customization, the financial efficiency justifies the purchase.
Specs at a glance
Pros & cons
What works
- Consolidated sourcing — saves $25-35 versus separate lower and LPK purchases
- Polished trigger group provides consistent 3.5-4.5 lb pull out of the packaging
- Includes anti-walk pins — prevents migration during high-volume firing
- DPMS Gen 1 compatibility verified across 100+ upper test fittings
- Forge option uses 7075-T6 aluminum with 83,000 psi tensile strength
Trade-offs
- Fire-control pocket requires precise 0.860-inch depth milling — no tolerance for error
- No jig included — requires separate $129-$199 tooling purchase
- 6061-T6 billet option is 8% less durable in shear strength than forged alternative
- Safety selector hole is undrilled — adds one additional drilling operation to complete
Key attributes
| Caliber | .308 Winchester / 6.5 Creedmoor |
| Lower Type | 80% Lower Receiver |
| Pattern | DPMS Gen 1 |
| Material Options | 6061-T6 Billet or 7075-T6 Forged |
| Trigger Pull Weight | 3.5–4.5 lb |
| Fire Control Pocket | Requires milling to 0.860 in depth |
| Serialization | None |
| Paperwork | No FFL required |
Specifications
| chambering | .308/6.5 Creedmoor |
| lower_type | 80% lower |
| pattern | DPMS Gen 1 |
| machining_options | 6061-T6 billet or 7075-T6 forged |
| trigger_pull | 3.5–4.5 lb |
| fire_control_pocket | Requires finishing |
| serialization | None |
| shipping | Direct to door (21+) |
| paperwork | No FFL required |
Best for
- Battle rifle build
- Precision DMR
- Heavy-hitting carbine
- DPMS Gen 1 pattern rifles
- Big-bore ghost gun
Materials
- 6061-T6 aluminum billet
- 7075-T6 forged aluminum
- Mil-spec steel parts
- Polished trigger group
- Anti-walk pins
What's in the box
- .308 80% lower
- LR-308/AR-10 lower parts kit
- Hammer
- Trigger
- Anti-walk pins
Care
Frequently asked questions
- Is it compatible with DPMS Gen 2 uppers?
- No, this 80% lower is specifically patterned for DPMS Gen 1 systems only. Gen 2 uppers have different takedown pin spacing and will not mate correctly without permanent modification. Verifying your upper receiver's pattern before purchase is critical—Gen 1 compatibility is non-negotiable.
- Does this work with a standard AR-15 parts kit?
- No, LR-308/AR-10 lower parts are dimensionally distinct from AR-15 components. The hammer pin is 0.170 inches in diameter versus AR-15's 0.154 inches, and the bolt catch is 0.312 inches longer. Attempting to use AR-15 parts will result in functional failures and potential safety issues.
- How long does shipping take?
- Orders ship within 1-2 business days via UPS Ground or USPS Priority. Delivery to most continental U.S. addresses takes 3-5 business days from shipment confirmation. International shipping is not available, and APO/FPO addresses require separate verification.
- Can I return it if I make a machining error?
- No, returns are not accepted for items that have been physically altered, including any machining, drilling, or finishing attempts. The company's policy clearly states that once material is removed, the item is considered consumed and ineligible for refund. Builder error falls entirely on the purchaser.