On Sale
FU Bug Upper 16'' Carbine, 5.56, 1/7, 4150V Black Nitrite, Upper
On Sale
FU Bug Upper 16'' Carbine, 5.56, 1/7, 4150V Black Nitrite, Upper

FU Bug Upper 16'' Carbine, 5.56, 1/7, 4150V Black Nitrite, Upper

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  2. FU Bug Upper 16'' Carbine, 5.56, 1/7, 4150V Black Nitrite, Upper
Firearms Unknown
Article code:
Out of stock
Delivery time:
This item will be back in stock in approximately 2-3 weeks

Product description

The BUG upper is one of our best selling upper recievers, this BUG upper comes with the following parts:

-16" 4150v Black Nitride M4 Barrel, Carbine gas system.
-Steel low profile, black nitride gas block with stainless steel gas tube. 
-FU BUG M-Lok 15" hand guard 
-Bird cage muzzle device. 
-M16 Black nitride bolt carrier group
-Mil-spec charging handle
-Forged 7075 M4 mil-spec upper reciever

Like all of our uppers, this upper comes test fired with our lifetime warranty.   


All of our custom AR15 uppers come with a LIFETIME warranty. Each is made with hand selected parts by our build specialists and goes through individual testing for fit and function. With these uppers you are not only getting a great upper receiver, but you are also buying peace of mind; if for any reason related to the manufacture of the parts your upper has any sort of a problem, we will fix it, or replace it, for the rest of your life.


Christian Loya
27-07-2019 19:32
I bought one these uppers for my brother for a gift, and when we went out shooting and it out shot, not one, but TWO of my builds I knew that this was absolutely money well spent and I had to come back to pick one up from their National City store. I have an entry level upper from PSA, and one that I put quite a bit more into with a mix of Aero, Anderson, BCM, Strike and Blitzkrieg Tactical. I do not know if its the way I put it together or if the parts I have just do not work well with each other, but both of these uppers I bought from Firearms Unknown, one via website and the other was an in store purchase, seem to feel better when shooting and they are just so accurate. **One thing I have upgraded on the upper, was the BCG. When I went in to buy my upper, the sales person made me aware of a sale they had going on with a Nickel Boron BCG and I jumped right on it. For under $80 I got one of the better NiB BCG's I have seen, and now I have the original BCG as a back-up. (Nothing wrong with it, just a phoshate coating.) I was helped by Andrew and Grover and they were as easy to talk to as an old friend. Awesome store, quality parts.
All in All, when you look at QUALITY and the company backed warranty for life, this is one of if not the BEST deals you can find around. Keep it up guys!
5 stars based on 1 reviews

Product specifications

Lifetime Warranty: YES
Caliber: 5.56
Barrel Length: 16"
Barrel Twist Rate: 1:7
Barrel Material: 4150v
Muzzle Device: Bird Cage
Gas-System: Steel Low Pro, Carbine Length
Handguard: M-Lok Free Float
Upper: Blitzkrieg Tactical Forged Upper w/ Forward Assist and Dust Cover
Bolt Carrier Group: Black Nitride M16 BCG
Charging Handle: Blitzkrieg Tactical Mil-Spec Charging Handle
Test Fired: YES
Condition: New

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