LR-308 Rifle Kit - 20" Nitride Barrel, 1:10 Twist & 15" M-Lok Handguard with Fire/Safe Marked 80% Lower



Wanna reach out and clang steel plates at great range?  We finally have the means to allow you to do so.  This LR-3o8 build kit will have you shooting .308WIN rounds downrange in no time. This kit's upper assembly gives you a 20" nitride-coated barrel. 

The added 15" M-Lok handguard stretches just a couple inches shy of the entire barrel length which gives you a nice, long sight radius should you choose to mount backup sights on it.

Please note:  this kit will create an LR-308 rifle, and not an AR-10, which is a design proprietary to Colt only. 

But that's the good part. 

The vast majority of .308-sized AR parts out there are made for the LR-308 / SR-25 platform.  Just be sure that any accessories you get for this bad boy are compatible.

LR-308 Rifle Kit Specs:

Barrel Length: 20"

Barrel Profile: Light contour

Gas System: Rifle-length

Barrel Steel: 4150 CMV, match-grade

Barrel Finish: Nitride

Muzzle Thread: 5/8-24

Chamber: .308 Winchester 

Twist Rate: 1:10

Diameter at Gas Block: 0.750”

Gas Block Type: Low-profile

Muzzle Device: .308 Shark Muzzle Brake

Receiver Material: Forged 7075 T6

Receiver Type: Low-profile w/ Picatinny

Handguard Type: Custom, super-slim 15” M-Lok

Bolt Carrier Group Included: Yes

Bolt Steel: Shot-peened, MPI-tested, 9310

Bolt Carrier Profile: M16 Full-auto

Charging Handle Included: Yes

LR-308 Rifle Kit Features:

  • Compatible with all DPMS .308/LR-308 parts
  • Features match-grade 4150, nitride-coated barrel
  • Includes all the parts you need to build an LR-308
  • Not considered a firearm, no FFL required
  • Upper ships pre-built, ready to fire
  • Proudly made in the U.S.A.
  • Backed by Lifetime Warranty

Barrel: Nitride-coated, match-grade, 20”, chambered in .308 Winchester. Made of 4150 CMV steel. Features 1:10 twist rate and rifle-length gas system. Includes custom 15” slant M-Lok handguard, 0.750" diameter low profile gas block, and .308 Shark Muzzle Brake.

Upper: Mil-spec, made of forged 7075 T6 aluminum. Hard-coat anodized (Type III).

Bolt: Mil-spec, M16 full-auto. Shot-peened, made of 9310 steel. Includes 8620 gas carrier.

80% Lower: Complete with an optional 80% lower. All lowers include mil-spec fittings and hard-coat anodizing.

Lower Parts Kit: Includes mil-spec CMMG lower parts kit. Features six-position M4 buttstock, shorty buffer tube, and .308 buffer.

Charging handle: Standard 7075 Forged charging handle.

Please note: If completing your LR-308 build using the optional 80% lower, please select an 80 lower jig from our available options.

No FFL required  Made in the USA  Lifetime Warranty

Shipping Restrictions only ships within the United States. Federal legislation dictates we cannot ship our products internationally. Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website. We try our best to keep our shipping page current, but laws change daily.

We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.