M5E1 Builder Set w/ 15" M-LOK Handguard - Thin Blue Line

Special Price $449.99 Regular Price $599.99
Out of stock
This is an FFL item. Please read our Terms and Conditions


This is a controlled item and requires shipping to an authorized and valid Federal Firearms License (FFL) holder.

If you have a copy of the FFL, please email it to ffl@aeroprecisionusa.com

If you do not have a copy of the FFL but you do have the dealer's email address, please add it in the comments field at checkout. It may help us acquire a copy of the FFL and get your order shipped out more quickly.

Please Note: All items in this order will be shipped together. If you have non-FFL items on this order that you would like shipped directly to you, please place them on a separate order.

There will be a 30% restocking fee for all controlled items returned due to a failed background check or a denied underage purchase.

Federal law requires that you be 21 years or age or older to purchase a stripped receiver or frame. If a frame or receiver can only be made into a long gun (rifle or shotgun), it is still a frame or receiver not a handgun or long gun. However, they still are "firearms" by definition, and subject to the same GCA limitations as any other firearms. See Section 921(a)(3)(b). 18 U.S.C. Section 922(b)(1) makes it unlawful for a licensee to sell any firearm other than a shotgun or rifle to any person under the age of 21.


The responsibility of being a Law Enforcement Officer is a demanding profession. In the course of their duties, the men and women of our Local, State and Federal Police agencies gift us with their bravery and selflessness. The "Thin Blue Line" serves as a barrier between lawlessness and safety, and Aero Precision would like to honor, recognize, and support the law enforcement community during National Police Week.

The Thin Blue Line Builder Set serves as a symbol of support for our Law Enforcement Customers. We thank you for your service to the citizens of our great nation.

This package deal includes the finished pieces you need to assemble your own Thin Blue Line Cerakote M5E1 Rifle, including an M5E1 Enhanced Upper Receiver, M5 (.308) Lower Receiver and our Gen 2 Enhanced Handguard of choice all finished in Thin Blue Line Cerakote.

Our Thin Blue Line builder sets were coated by Weapon Works.


  • M5E1 Enhanced Upper Receiver finished in Thin Blue Line Cerakote. The upper receiver is assembled and includes the forward assist, dust cover and barrel nut.
  • 15" Enhanced Gen 2 M-LOK Handguard finished in Thin Blue Line Cerakote
  • M5 (.308) Lower Receiver finished in Thin Blue Line Cerakote

This May Builder Set is available in M4E1 (AR15) 15" Enhanced Handguard, M4E1 (AR15) 9" ATLAS S-ONE Threaded, M4E1 (AR15) 15" ATLAS S-ONE Threaded, M4E1 (AR15) 9" ATLAS R-ONE Threaded, M4E1 (AR15) 15" ATLAS R-ONE Threaded or M5E1 (.308) Enhanced configurations.

Shipping to FFL Dealer RequiredYes
Made In America?Yes
Select Your FinishThin Blue Line
Weight(s)40.17 oz
Other Features-
Submit your photo of this product for a chance to be featured on our website!
Upload Your Images
No image chosen

Add Additional Image

Write Your Own Review
You're reviewing:M5E1 Builder Set w/ 15" M-LOK Handguard - Thin Blue Line
Your Rating