Introducing the Lower Build Kit you didn’t know you needed. The NBS Bare Bones Lower Build Kit. All of our other lower build kits, and many others on the market include a Fire Control Group, Stock  and Grip by default, even though many builders opt for an upgraded stock, grip and trigger group. Most of our builds here in the shop include a separately sourced FCG, stock, grip and trigger guard so this kit was born out of necessity and now we’re offering them to all of our customers. Don’t spend your hard earned dollars on parts that’ll end up sitting around collecting dust.
This kit includes true mil-spec hardware so you can be confident that you’re building on a solid foundation.
NBS Mil-Spec Lower Parts Kit Minus FCG & Pistol Grip
The NBS Mil-Spec Lower Parts Kit Minus Fire Control Group and Pistol grip is everything you need and nothing you don’t. This kit, sourced from an OEM supplier of many name brand manufacturers, it is perfect for the builder who expects quality and will be choosing an upgraded grip and trigger group. It consists of high quality mil-spec or better parts. These are precision CNC machined parts, not MIM. Each kit includes:
- Safety Selector, Selector Spring and Detent
- Magazine Catch, Spring and Button
- Trigger Guard and Roll Pin
- Front Pivot Pin
- Rear Take Down Pin
- Two Takedown / Pivot Pin Detents
- Two Takedown / Pivot Pin Detent Springs
- Bolt Catch, Plunger, spring and Roll Pin
- Buffer Retainer Pin and Spring
Backed by the NBS Limited Lifetime Guarantee.
NBS Mil-Spec Carbine Buffer / Receiver Extension Kit
- Mil-Spec Carbine Buffer Tube / Receiver Extension
- 6 Position
- 7075-T6 Aircraft Grade Aluminum
- Hard Anodized
-
Carbine Buffer Spring
-
Castle Nut/Receiver Nut
-
Mil-Spec Receiver End Plate
-
Carbine Recoil Buffer properly weighted (3oz) and constructed w/ separate counter weights NOT a solid weight.
- Backed by NBS Limited Lifetime Guarantee.
NBS — Our In-House Brand for Builders Who Demand Reliable Performance and Real Value.
Designed for builders who demand reliable performance and real value without unnecessary hype or inflated pricing. NBS stands for "No Bullshit."
Built on Strong Industry Partnerships
Through the strong partnerships AR15Discounts has built with trusted suppliers and vendors, we regularly gain access to premium components often manufactured by or for leading industry names. By purchasing these in volume, we bring them to you under the NBS label, ensuring proven quality reaches your build at a fair price, without the added cost of extensive marketing.
Quality You Can Trust
Every NBS product is specified to the exacting standards we apply to our own rifles. Each component features precision CNC machining, American-made key components where it counts, robust materials, dependable steels, and durable finishes engineered for long-term reliability. These items are either sourced from reputable OEMs or carefully assembled in-house using established name-brand elements, maintaining consistent excellence throughout the lineup.
Complete Solutions for Serious Builders
From stripped and complete uppers to bolt carrier groups, handguards, lower parts kits, and beyond, NBS provides a unified, affordable selection that allows you to complete confident, high-performing builds.
Backed by a Limited Lifetime Warranty
All NBS products come with our Limited Lifetime Warranty for the original owner, covering defects in materials and workmanship. AR15Discounts stands firmly behind these parts because, as shooters ourselves, we use and trust them, delivering honest value and gear you can rely on.
| Weight | 16 oz |
|---|---|
| Brand | nbs |
Compliance
NFA (National Firearms Act) compliance is crucial for legal ownership and transfer of regulated firearms and accessories like short-barreled rifles, suppressors, and certain types of ammunition, ensuring adherence to federal regulations to avoid legal penalties and ensure responsible firearm ownership.
Customer Reviews
- Reviews
- Questions
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- quality
- issues
- price
- value
- finish
- build
- TRIGGER
- rounds
US
Basic build kit
Good build kit gets the job done highly recommend
USQuality Lower Build Kit
I've used this LBK on several builds, and haven't had any issues. Everything fit and functioned as advertised. I would recommend this Kit for any budget build.
USQuality Lower Build Kit
I've used this Kit on several builds, and haven't had any issues. All quality mil-spec parts. I'd recommend this Kit for any budget build.
USWhat I needed
Had the parts I needed for my lower because I didn't want a milspec trigger and stock
USNBS lower build
AR15DISCOUNTS hits another one out of the park. Great parts, great service...what more can you ask?
