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Aero Precision M5 .308 Enhanced Lower Parts Kit

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If you're starting an LR-308 build, you'll need a lower parts kit. How about an LPK with an upgraded grip?. Aero Precision's M5 Enhanced .308 Lower Parts Kit provides just that: Quality, mil-spec internals for your stripped lower receiver, or finished .308 80% lower, plus a Magpul MOE pistol grip.

NOTE: Because of minor variances in the M5 receiver's design, the M5 .308 LPK's takedown and pivot pins protrude from other .308-type receivers slightly more. This does not affect functionality in any way.

What's Included

  • Takedown/pivot Spring
  • Takedown/pivot detent
  • Trigger/hammer pin
  • M5 .308 Takedown pin
  • M5 .308 Pivot pin
  • M5 .308 Bolt Catch
  • Bolt Catch Spring
  • Bolt Catch Buffer
  • Bolt Catch Roll pin
  • Safety Selector
  • Safety Selector Spring
  • Safety Selector Detent
  • Buffer Retainer
  • Buffer Retainer Spring
  • A2 Pistol Grip
  • Pistol Grip Screw
  • Pistol Grip Lock Washer
  • Trigger Spring
  • Hammer Spring
  • Disconnector Spring
  • Magazine Catch Body
  • Magazine Catch Spring
  • Extended Magazine Catch Button
  • Hammer
  • Trigger
  • Disconnector

Required Tools

To install all the components listed above, you'll need a pair of roll pin punches and a gunsmithing hammer. An Armorer's Wrench is recommended for installing the buffer assembly (sold separately, see details below).

Grab everything you need from our Gunsmithing Tools.

Easy-to-Follow Install Instructions

First time assembling, or need assistance with certain steps? Check out our in-depth instructional and picture guide. It shows the full LPK assembly with tips and tricks, including tools required and the buffer tube and castle nut install.

Buffer Assembly Sold Separately

This lower parts kit does not include a buffer tube, stock or brace, nor a buffer or recoil spring. Those components can be purchased here.

Finishing Your .308 Build

To complete your lower with this parts kit, you'll also need a .308 buffer tube kit, which are available here.

Not sure which other components you need to assemble a working .308 AR? Check out our barreled .308 upper assemblies. They include a bolt carrier group and charging handle, and ship ready to install atop your completed lower.



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.

Aero Precision

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.