LR-308 Side-Charging Rifle Kit – 18” Black Nitride, SOCOM Barrel, 1:10 Twist Rate with 15” M-Lok Split-Rail Handguard

All barrels wear, become less accurate with time, and gradually break down. So give your next LR-308 build the chance it deserves to maintain its accuracy as long as it possibly can. And with this side-charging LR-308 build kit, you can do it without having to resort to going full-on with a heavy-profiled barrel.

This side-charging LR-308 build kit starts with an 18-inch SOCOM profile barrel. It’s paired with a 15-inch free-floating M-Lok handguard. You also get a 6-position buffer tube assembly and the butt stock to install onto it. This kit also comes with a standard 308-sized lower parts kit. All you need to do is finish your 80% lower receiver, which you can find here. Then, get the backup sights or optic of your choice, and you’re ready to build. And once you snag some mags and ammo, you’re in business.

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

Barrel

• Chamber: .308 Winchester
• Contour: SOCOM
• Length: 18”
• Twist Rate: 1:10
• Gas System: Mid-length
• Gas Port Barrel Dia: 0.086”
• Muzzle Threads: 5/8×24
• Material: 4150 Chrome Moly Vanadium
• Finish: Black Nitride
• Process: Button Rifled
• Lining: Stainless
• Muzzle: A2-style “birdcage”

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.