Enjoy free shipping during the holidays! Shop now and get
Free Value Shipping
on most orders over $49 to the contiguous 48 states, DC and to all U.S. Military APO/FPO/DPO addresses.
Enjoy Our Extended FREE RETURNS
We want to ensure that making a return is as easy as possible! With our Hassle-Free, Extended
Holiday Returns, eligible orders placed from November 12, 2025 on will benefit from an extended
return deadline (January 13, 2026 or 30 days after receipt of your order - whichever is later).
We'll even cover the cost of return shipping. Learn more about our
Return Policy.
Please Enable Your Browser's Cookies Functionality
Cookies are not currently enabled in your browser, and due to this the functionality of our site will be severely restricted.
Web browser based cookies allow us to customize our site for you, save items in your cart,
and provide you with a great experience when shopping OpticsPlanet.
Your privacy is important to us, and any personal information you supply to us is kept strictly confidential.
If you cannot enable cookies in your browser, please contact us — we are always here to help!
JavaScript is blocked by AdBlocker or ScriptBlocker
We're sorry - it looks like some elements of OpticsPlanet are being disabled by your AdBlocker.
Unfortunately we are unable to offer our excellent shopping experience without JavaScript.
Please add "opticsplanet.com" and "https://opl.0ps.us/assets-9ca4d906545/" to whitelist,
or disable AdBlocker for this site (please note that we do NOT feature any annoying ads on this website).
Thanks!
Your Browser is Outdated
Unfortunately, we are unable to provide an excellent shopping experience on your browser because it lacks modern functionality needed for us
to provide a fast, secure, and enjoyable experience. If you cannot upgrade your browser or use an alternative device to visit us,
please contact us at +1-800-504-5897 and we'll be happy to assist you over the phone!
Stag Arms AR-15 A3 Flattop Upper Receiver Up to $10.00 Off w/ Free Shipping — 3 models
this is my second stag left handed upper that I have purchased. Both have been well made and high quality, this one is no exception. I was able to put my rifle together with no issues and this thing is holding up just fine.
My first experience with Stag. The upper is well made and no complaints. I do see that I will have to modify/shorten the ejection port cover rod to make the upper work with a rail that has anti-rotation that extends on the upper’s sides. Other than t...
Read More...
Arrived on my front door step on National Left Hand Day. Today!!! Coincidence? Cant wait to put this together and test. Finally. No more burnt biceps. Looks like well built, good quality. Fast shipping.
I'm left handed. If you buy this, you will need to also have left handed everything. The BCG must be a left handed one (only made by Stag). The free-float rail also will not fit this since the ejection port opens from the top. I couldn't get it to fi...
Read More...
Eligible models will have a savings offer and the coupon code to use below. Add the item to your cart and enter coupon code for savings on that select model! Limited time only. Cannot be combined with other promotions or offers.
3 Models Available
Show with deals only:
Coupon Available
Color
All
Finish
All
Hand
All
Search
Color: Black Finish: Type 3 Hardcoat Anodized Hand: Right
Code: 2PS-UPR-AR15A3FURA-STAG300412
MPN: STAG300412
UPC: 811546026719
List: $119.99Save $10.00
$109.99
Color: FDE Finish: Cerakote Hand: Left
Code: 2PS-UPR-AR15A3FURA-STAG310864
MPN: STAG310864
UPC: 840213903336
List: $129.99Save $10.00
$119.99
Color: Black Finish: Type 3 Hardcoat Anodized Hand: Left
Help support American manufacturing! Marked models of this product have gone through rigorous review and been certified by the manufacturer as Made in the USA.
Product Info for Stag Arms AR-15 A3 Flattop Upper Receiver
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.