Firearms Unknown GUNGNIR 16" Complete AR Rifle 300BO 1:7 Caspian Black

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A badass rifle for badass people.

Firearms Unknown
In stock
Delivery time:
This product should ship within 1 to 3 business days.

Product description

We are proud to put out this rifle based on our Gungnir lower receiver.   

This rifle is chambered in 300BO/300AAC and has a pistol gas system.   Why did we build a 16" rifle with a pistol gas system?  So it will cycle anything without a suppressor.   

Over the years we have seen a ton of 300BO configurations and carbine gas 16" uppers/rifles struggle to cycle sub-sonic ammo while not suppressed.  Yet, pistol gas systems cycle sub-sonics fine. 

If you are planning on running a suppressor most of the time, then is probably not the rifle for you.  If you run this rifle suppressed you may end up over gassed which would require adding a adjustable gas block or gas key.     

These rifles were built with care by our expert staff at our National City location.   To start the process the barrel is bedded and cured into the upper receiver. 

After cure, the upper is built with our 15" Caspian hand guard and high end quality components (see parts list below).   

The lower is built and function tested.   

Once the upper and lower are built they are assembled into the complete rifle, test fired they bagged for the customer.    

As is the case with all of our products this is a high end product that is being sold at a moderate price. 

Nothing needs to be done or added to this rifle to get it where you want it.  



Here is the parts list.


Upper Specs: 

Mil-Spec Forged Upper, 7075, M4 Feed ramps, Type III Hard coat anodized

Nib 5.56 M16 BCG

Billet Charging handle with Extended latch

16" 4150v 300BO Barrel, Black Nitride Treated, Mid-Length gas system, 1:7 Twist

Steel, Nitride low profile gas block

Stainless steel pistol-length gas tube

15" Black Caspain M-Lok Hand Guard

Aero Precision Gamma 300BO Compensator


Lower Specs:

Firearms Unknown Gungnir Forged 7075 mil-spec Lower Receiver

Blitzkrieg Tactical Freyr Match Trigger 

Blitzkrieg Tactical Osprey Ambi Selector

Blitzkrieg Tactical Black Ergonomic Grip

Blitzkrieg  Tactical 5.56 Carbine Buffer Tube Kit

Black Magpul CTR Stock 


This rifle comes with the following items: (1) Rifle, (1) Cable Lock, (1) FU Sticker, (1) FU Warranty Certificate, (1) 30rnd MFT Magazine (10/30 for CA), (1) Rifle Case


Test Fire:   This rifle is test fired and maintains our lifetime warranty (see below for warranty details).  

California Compliance: This rifle is being NOT being sold as a California Compliant rifle.  However, if you wish, we will add a strike stop stock and kydex grip to the rifle to make it California Compliant.   


Lifetime Warranty: We guarantee this product to be free from defects. In the event you feel you have a defective product, please contact us immediately to arrange inspection of the product. In the event we determine the product is defective; we will repair or replace the product with an identical or "like kind" product free of charge. This warranty does not cover standard wear and tear, is not transferable and may be voided if the customer or a third party alters the product in any way.


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