Real time inventory. No backorders. Ships within 3 - 5 Business Days!

Classic Lower Build Kit | Classic Lower Parts Kit | Butt Stock | Buffer Tube Assembly | AR-15

Was: $77.99
Now: $64.99
SKU:
AR15-LPK_M4-STOCK_AR15-BTA
Availability:
In Stock! Ships within 3 - 5 Business Days!
  • Fast Shipping

  • Thousands of Reviews

  • 7 Day Customer Service

  • Amazing Selection

No 80% lower receiver build is complete without a butt stock assembly – and this one comes with all you need: lower parts kit, butt stock, buffer tube assembly. A lower parts kit is essential to finishing your 80% lower. To have multiple build kits, or lower receivers to swap out on your AR-15 rifle, it’s crucial to have multiple lower parts kits.

Sure, there are no fancy color coded bags. But rest assured this LPK offers all the same parts needed to finish your 80% lower, and for a fraction of the cost. This lower parts kit comes with all the internal parts needed to finish your lower, from the pivot pin to the trigger, with this kit you’re ready to complete your AR 15 build kit.

Please note: This LPK is also compatible with our AR9 80% lowers. The mag release will be different, but not to worry. Each AR9 80% lower comes with its own included mag release.

Here's our written guide on how to install the AR-15 lower parts kit.

This Lower Parts Kit Includes:

  • Hammer
  • Pistol Grip
  • Trigger

Pivot & Takedown

  • Pivot Pin
  • Pivot Pin Detent
  • Pivot Pin Detent Spring
  • Takedown Pin
  • Takedown Pin Detent
  • Takedown Pin Detent Spring

Bolt Catch & Buffer Retainer Assembly

  • Bolt Catch
  • Bolt Catch Plunger
  • Bolt Catch Roll Pin
  • Bolt Catch Spring
  • Buffer Retainer
  • Buffer Retainer Spring

Trigger & Hammer Assembly

  • Hammer Pin
  • Hammer Spring
  • Trigger Pin
  • Trigger Spring
  • Disconnect
  • Disconnect Spring

Magazine & Trigger Guard

  • Magazine Catch
  • Magazine Catch Spring
  • Magazine Release Button
  • Trigger Guard
  • Trigger Guard Roll Pin

Safety Select & Pistol Grip Connect

  • Safety Selector
  • Selector Detent
  • Selector Detent Spring
  • Pistol Grip Lock Washer
  • Pistol Grip Screw

Butt Stock Kit Includes:

This butt stock kit includes both an adjustable carbine stock and buffer tube assembly. The adjustable carbine stock is constructed from a durable polymer composite and is designed for quick adjustment. Additionally, this carbine butt stock offers three different sling attachment options.

Buffer Tube Assembly Includes:

The buffer tube assembly provides a mil-spec diameter 7075 buffer tube, lock ring & castle nut, latch plate, buffer housing and buffer spring. Purchase this butt stock assembly today for your next 80% lower receiver build.

WARNING: Handling firearms parts and 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 go to: www.P65Warnings.ca.gov

Shipping Restrictions

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 or "assault weapons" (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 or machining a firearm. We try our best to keep our shipping page current, but laws change daily.

80-Lower.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.

Platform:
AR15
Caliber:
5.56
Caliber:
.223 Wylde
Caliber:
.300 AAC Blackout

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, Hawaii, 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.