LW-4 Stripped Polymer Lower

(1 Review)
Category: Stripped Lower Receivers
: LW-4 Lower
: AR-15
BBL Length
: N/A
: N/A
Magnification Range
: N/A
Tube Size
: N/A
: N/A
: Black Ano

LW-4 Stripped Polymer Lower Receiver

Manufacturer: New Frontier Armory

Model: LW-4

The New Frontier Armory LW-4 polymer lower is the strongest polymer based lower receiver ever made. It is manufactured using Nylon 6, a glass filled and chemically coupled nylon polymer for maximum durability and strength.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 glass filled nylon-6 reinforced polymer construction
    • Accepts all MIL-SPEC and standard AR-15 parts and upper receivers
    • Utilizes a square nut that seats in the pistol grip boss to provide a stronger, more durable attachment of the pistol grip (screw, washer and nut included!)
    • Lifetime warrantyon all our lowers
    • Half the weight of an aluminum lower
    • Weighs only 4.15 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.



Don't forget to check out our Polymer LPK to keep your build ULTRA Lightweight and avoid voiding your warranty!! Find themby CLICKING HERE.


Q: Can I build myupper while attached to the lower receiver?

A: NO!When assembling your upper receiver DO NOT torque the barrel nut or muzzle brake while the upper is attached to the LW-4 (or any other model) lower receiver. Assembling the upper improperly could cause damage to the lower receiver and will NOT be covered under the factory warranty.When assembling an upper you should use a reaction rod or a vise block specific for assembling upper receivers.

The New Frontier Armory LW-4 Stripped Polymer Lower Receiver is proudly MADE IN THE USAby hard-working American men and women.


This is a serialized item considered to be a firearm by BATFE. This item must be shipped to a Federal Firearm License (FFL) holder. All BATFE, GCA & NFA rules apply! This item must be shipped to a Federal Firearm License (FFL) holder. You will be prompted at checkout to pick an FFL to ship to in your area using our FFL Locate tool.YOU will be responsible for checking with your local FFL to ensure this weapon is legal in the state that you reside and that they will accept this weapon on your behalf and transfer it to you.New Frontier Armory, LLC will NOT be responsible for any shipping or admin charges incurred by packages not being accepted by the FFL you choose during checkout.

Weight: 0.51 LBS
Dimensions: 9.50 x 4.50 x 2.25 in
Size: N/A
Color: Black Ano

Reviews (1)

Written by kayakjeenyus on 8th Mar 2021

I bought this to replace my polymer 80% lower that only lasted a year on my 300 blackout AR Pistol. I've had this carbon fiber lower for 2 or 3 years now and it is great.! and it is half the weight of my polymer lower. here are some lower weights to compare this to, my stripped billet lower weighs 10.4 Oz., my polymer lower weighs 5.86 Oz., and this carbon fiber lower only weighs 3.73 Oz! you will notice the weight difference when you switch to one of these. And it is plenty strong for the 30 cal. bullets I use. I use my AR pistol when camping in wilderness areas and hiking on the Appalachian trail. It is outside a lot and still looks and functions as it always has, if your looking to lighten up your AR, this is the best lower for the job. the bolt lever fits and works great on it too. unlike my Black Rain Ordnance Billet Lower, it doesn't clear on that. I build ar's and have tried several brands over the years, but this is the one I tell my clients to get. I only build side charging uppers and it's great for those too. the parts fit nicely and I have never had a problem with anything on this lower. this is the best and cheapest way to reduce the weight of your AR and it is super strong. Now I am slowly replacing the lower parts with titanium parts, and those can be expensive, but you don't have to buy them all at once, buy a few here and there and it doesn't take long to make this even lighter, comes in handy when carrying it in my back pack on the trails I hike. I will be buying more when they come back in stock. was hoping to buy one today but see they are out of stock. you will definitely like it so buy with confidence. New Frontier makes good stuff!

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