Rock River Arms has a reputation for machining the highest quality and most accurate rifles in the market. Their success is attributed to the quality control measures every part and firearm must pass. Expanding their busines model, they now sell the same high quality parts individually. This complete upper receiver is a true testament to the quality parts Rock River machines.
Features and Specifications:
Manufacturer Number: BB0400
Caliber: 5.56 NATO (accepts .223 Remington)
Receiver Material: Extruded Aluminum A4
Port Door, No Forward Assist
Barrel Length: 16"
Barrel Twist: 1:9
Barrel Material: Lightweight Chrome Moly
Muzzle: A2 Flash Hider
Muzzle Thread: 1/2x28
Gas Operation: CAR Length Gas System, Low Profile Gas Block
Handguard Length: CAR Length
Handguard Style: Free Float
Handguard Material: Aluminum
Handguard Rails: M-LOK, MIL-STD-1913 Picatinny Top Rail
Overall Weight: 4.0 lb.
Includes:
Bolt Carrier Group
Charging Handle Assembly
This product is not returnable. Contact the manufacturer for warranty and assistance.
Features and Specifications:
Manufacturer Number: BB0400
Caliber: 5.56 NATO (accepts .223 Remington)
Receiver Material: Extruded Aluminum A4
Port Door, No Forward Assist
Barrel Length: 16"
Barrel Twist: 1:9
Barrel Material: Lightweight Chrome Moly
Muzzle: A2 Flash Hider
Muzzle Thread: 1/2x28
Gas Operation: CAR Length Gas System, Low Profile Gas Block
Handguard Length: CAR Length
Handguard Style: Free Float
Handguard Material: Aluminum
Handguard Rails: M-LOK, MIL-STD-1913 Picatinny Top Rail
Overall Weight: 4.0 lb.
Includes:
Bolt Carrier Group
Charging Handle Assembly
This product is not returnable. Contact the manufacturer for warranty and assistance.
1 Rating
Love it
Mated perfectly to my Spikes lower. Have but a couple hundred rounds through it so far flawlessly. Cons: No forward Assist but I personally don't need it
August 13, 2020
Why is there no forward assist on this model?
Answer:
That is a design choice some manufacturers are going with and some shooters are looking for.
Does it come in FDE color?
Answer:
No it does not.
What colors is available
Answer:
Black
How many rounds of .223 can be fired accurately from this type of upper assembly
Answer:
That is compltely dependant by your firing schedule.
What type of fixed sights/scope works for this upper?
Answer:
You can use any scope or sight with this upper. I prefer a red dot or a a 1-6 like item SCP-014-012
What kind of bolt carrier profile is the carrier?
Answer:
Semi-Auto last time I checked.
Is this mil spec?
Answer:
It is.
Is the barrel chrome lined ?
Answer:
No it is not.