Aero Precision M4E1 Complete AR15 Lower w/ M4 Collapsing Stock

Product Description

Aero Precision AR-15 Complete GEN 2 Lower Receiver with Carbine Collapsing Stock 

The M4E1 Lower Receiver delivers billet aesthetics in a forged package. This custom designed enhanced forging is machined from 7075-T6 Aluminum and compatible with all mil-spec AR15 parts. Aside from the visual upgrades this custom engineered design provides that challenge much more expensive billet options, we have added several functional features to the lower receiver to simplify the assembly process for the at home builder.

M4E1 Lower Receiver Improvements:

• Threaded Bolt Catch Roll Pin - Allows for simple installation of the bolt catch and virtually eliminates the chance to damage the finish during installation (pin included). 1/16" Hex Key required for assembly.
• Integrated Trigger Guard - Eliminates the possibility of breaking the trigger guard tabs by integrating the trigger guard into the lower, creating a stronger more rigid platform to build upon.
• Upper Tension Screw - Allows users to fine tune the fit of the upper and lower receiver using a nylon tipped tensioning set screw inserted in the grip tang of the lower receiver. This provides a tight fit with any standard AR15 upper receiver.
• Threaded Takedown Pin Detent Recess - Allows user to easily install the Takedown Pin detent and spring with the use of a 4-40 set screw (no more launching detents across the room).
• Increased Magwell Flare - Increased the flare of the magwell to aid in quick and efficient magazine changes.
• Marked and milled to accept short-throw safety selectors, but will work with standard selectors as well.
• Assembled in Victor, MT by SAA
• Complete Stock Assembly and Lower Parts Kit Installed 

*Firearm Purchases:

No AR lower purchases available for sale in CA, CT, MA, NJ, NY, WA.  No exceptions.  NOTE California:  When we moved from WA to MT we had to get a new FFL as well as a new CA DOJ license/number which we have yet to do, so we cannot ship any firearms into the state of California.

         NOTE:  Clock starts once we have both your firearm order AND your FFL.  Once we have both, your order will process and ship within the following week

  Check your state and local laws for any regulations that may apply.  By purchasing a firearm from MontanaAR15.com, you agree that you are legally allowed to do so.  Per federal law, you must be 21 years or older to purchase firearm receivers/frames & 18 years or older to purchase long guns.

• It is the customer's responsibility to coordinate arrangements for the receiving FFL to send a valid, fully signed copy of their FFL to MontanaAR15.com.  We do not contact dealers/FFL's.  Please include the business/trade name as it appears on the FFL license, city & state of FFL in the "COMMENTS" section of your order for our reference & faster processing.
  • Fax:  406-642-3513 
  • E-mail:  sales@montanaar15.com
• We SHIP TO VALID FFL's ONLY (Federal Firearm Licensee).
• Your order cannot be processed and will be retained until ALL required documents are submitted to and received by MontanaAR15.com.
• If we have shipped to your FFL in the past, please enter "FFL s/b on file" with the FFL's trade name as listed on the license in the "COMMENTS" section of your order (FFL on file must be still current & valid).
• Find an FFL Dealer Near You  (external link, this is NOT a list of FFL's that we have on file)
• Confirm the receiving FFL will accept a transfer from MontanaAR15.com for the applicable firearm.
• ***NOTE:  This is not a "long gun."  This is not a complete firearm.  Per federal law this cannot be transferred to you if you are not a resident of the same state as your provided dealer/FFL.  Unless you state in your order that your residency is different than your billing address (and we will require a copy of your state ID), any order with billing in one state, and the FFL in another will be canceled.
• For safety reasons, we DO NOT ACCEPT RETURNS ON FIREARMS, thus all firearms sales are final.
• IF you are denied for a background check through a the transferring FFL and the firearm(s) must be returned to the sender, (MontanaAR15.com) you will be assessed a 20% re-stocking & paperwork handling fee plus the cost of shipping upon pending refund.