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Del-Ton Del-Ton & New Frontier Armory 20" Heavy Barrel Rifle

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Model: LW-4 

The New Frontier Armory LW-4 carbon-fiber-reinforced polymer lower is the strongest polymer based lower receiver ever made. It is manufactured with the highest and most advanced carbon fiber construction on the market. This will be the perfect lower for your AR-15 build to make it extremely light and incredibly durable. We have a lifetime warranty on our lowers to back that up. 

Extremely durable with carbon-fiber-reinforced polymer construction 

Accepts all MIL-SPEC and standard AR-15 parts and upper receivers 

Lifetime warranty on all our lowers 

Less than half the weight of an aluminum lower 

Weighs only 3.65 ounces 

NOTE: Castle nut should be installed with a maximum torque specification of 20 Ft Lbs. Damage can occur to receiver if excessive torque is applied to castle nut. 

20" Pre-Ban Heavy Profile Rifle Kit w/STANDARD RIFLE Gas System 

Rifle kit comes with complete upper assembly head spaced and test fired, buttstock with components, and complete lower parts kit. 


Chrome Moly Vanadium 

M4 Feed Ramps 

20" Length 

1x9 Twist 

A2 Flash Hider 

Manganese Phosphated 

Phosphated under Front Sight Base 

Taper Pins in F-marked Front Sight Base 

Threaded Muzzle 

Heavy Profile 


5.56 X 45 mm 

Bolt And Carrier: 

Phosphated 8620 Steel Carrier Assembly 

Carpenter 158 Bolt HPT/MPI Tested 

Heat Treated and Plated 


Chrome Lined Carrier Interior 

Carrier Key - Chrome Lined, attached with Grade 8 Screws 

Properly Staked & Sealed Gas Key 


Standard (Rifle) Length 

Aluminum Delta Ring 

Single Heat Shield 

Upper Receiver: 

Forged 7075 T6 Aluminum 

A3 Flat Top with M4 Feed Ramps 

Hard Coat Anodized 


Ejection Port Cover and Round Forward Assist 

Right Hand Ejection 

Bore's surface is coated with dry film lube, over the anodized surface 


Standard A2 - Reinforced Zytel 

Trapdoor Assembly 

Determined at checkout.