A3 LH Flattop Upper Receiver Assembly

(33 reviews) Write a Review

The A3 upper receiver assembly is made to mil-spec standards and includes a picatinny rail on the top, dust cover, and installed forward assist.


Pivot/Takedown Pin Size: Small Pin .250"

Material: Forged and Mil-Spec 7075 T6 Aluminum with Type 3 Hard Coat Anodize

SKU: STAG310412


Q: Are the bolt carrier and charging handle included?

A: The bolt carrier and charging handle are sold separately.


33 Reviews

  • 5
    Left hand Upper

    Posted by Omar Taplin on 8th Jun 2021

    The part came ontime and in good shape

  • 5
    Just buy it already!

    Posted by K C on 8th Jun 2021

    If your a Southpaw this is for you. Nough said!

  • 5
    Upper receiver

    Posted by Ken mouring on 18th Apr 2021

    fits well no trouble with constructing the upper assembly

  • 5
    Left hand upper receiver

    Posted by Kings Point 75 on 18th Apr 2021

    If you're left handed, this beats using right handed tools.

  • 5
    Nice so far

    Posted by Dale on 15th Apr 2021

    I got this to build a left handed ar. So far I really like it. Have not been to the range as yet but the black rain bcg works fine in it. Fits better on my 5.56 lower than the new lower. Nice and tight no rattles. My only complaint is I didnt order 2.

  • 5
    Left hand upper receiver

    Posted by Earl Hodson on 15th Apr 2021

    Stag Arms makes a great product. Along with their left hand bolt carrier group, I was able to assemble a fine lefty rifle. The best price, and fast service is why they get a 5 star from me.

  • 5
    A3 LH Flattop Upper Receiver Assembly

    Posted by Edward Joseph Zook on 11th Apr 2021

    Fit as required, looks great. Have not gone to the Range yet... I'm a Lefty and can't wait to Not Have the empties flying buy.....

  • 4
    A3 Left hand Flattop Receiver

    Posted by Tuan Huynh on 10th Apr 2021

    If you’re a left hand shooter, this is a must have. This is my 3rd purchase from Stagarms. The only problem I’m encountering is my ejection port cover rod keeps coming loose after 7-10 rounds. I continually have to push it back into place otherwise it will come out.

  • 5

    Posted by Ed Wray on 8th Apr 2021

    So far so good and hope it remains that way