LR-308 Rifle Kit – 20” Stainless Steel, Fluted Mid-Weight Barrel, 1:10 Twist Rate with 15” M-Lok Handguard

Build your LR-308 rifle with this kit, and then really stretch out with your shots fired and go the distance. Up close, they’ll be blinded by the luster of your stainless steel barrel and compensator, while off in the distance they’ll hear the clang of your lead slamming steel. This build kit comes with a 20″ match barrel made of416R stainless steel, so you can count on it lasting the entire life of your LR-308.

A custom, free-float M-Lok handguard with low-profile gas system improves accuracy and provides plenty of rail estate for your favorite accessories and attachments. The inner workings are handled by a quality, mil-spec CMMG lower parts kit with a crisp, single-stage trigger. Out back, you’ll enjoy a classic six-position M4 buttstock paired with a .308-specific short buffer and spring.

What’s Included

This kit is not a firearm. It includes an assembled upper receiver, bolt carrier group, lower parts kit, and buffer assembly with buttstock.

Here’s the beginner’s guide to 80% lowers.

.308 AR Rifle Kit Specs

Barreled uppers are assembled in-house before shipment.

Barrel

• Chamber: .308 Winchester
• Contour: Mid-weight
• Length: 20”
• Twist Rate: 1:10
• Gas System: Rifle
• Gas Port Barrel Dia: 0.125”
• Muzzle Threads: 5/8×24
• Material: Match-Grade, 416R Crucible Stainless
• Finish: Stainless
• Process: Button Rifled
• Lining: Stainless
• Muzzle: Twisted SS Flash Hider

Handguard

• Attachment System: 15″ M-Lok
• Finish: Type III Hardcoat Anodized (Mil-Spec)
• Top Rail: M1913 Picatinny
• Material: Billet 6061-T6 Aluminum
• Attachment: Barrel Nut 

Upper Receiver

• Profile: LR-308 Flattop
• Material: Forged 7075-T6 Aluminum
• Finish: Type III Hardcoat Anodized (Mil-Spec)

Bolt Carrier Group

• Profile: M16/Full-Auto
• Steel: 9310 Tool, HPT/MPI-tested
• Exterior: Phosphate Coating
• Interior: Chrome-Lined
• Gas Key: Staked, Chrome-lined
• Charging Handle: Included

Lower Receiver Parts

• Buffer System: Mil-spec, .308 “Shorty” Buffer
• Buttstock: Mil-spec, M4-type
• Parts Kit: Mil-spec, single-stage

Lower receiver sold separately. 

WARNING: Handling firearms parts and certain firearm accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information, visit www.P65Warnings.ca.gov 

Shipping Restrictions 

We cannot ship certain parts and accessories to states that prohibit the sale or ownership of such components, like California, New York, and others. Before ordering, see our shipping restrictions for a list of all prohibited states and locales. We try our best to keep our shipping restrictions current, but state laws change almost daily. It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. 

80-Lower.com only ships within the United States. Federal law prevents international shipments of our products.