Does the Radical Firearms 5.56 Barreled Upper work with the Radical Firearms .450 Bushmaster?

Radical Firearms 5.56 Barreled Ar-15 Upper - 16" - Primary Arms Exclusive

Upper Receiver

Radical Firearms 5.56 Barreled Upper

Radical Firearms .450 Bushmaster Ar-15 Barrel - 20"

Barrel

Radical Firearms .450 Bushmaster

Radical Firearms upper and Radical Firearms barrel compatibility

They fit, with a catch

The Radical Firearms 5.56 Barreled Upper works with the Radical Firearms .450 Bushmaster, with one thing to check: Barrel thread pitch (5/8x32) does not match Upper Receiver thread pitch (1/2x28).

This exact setup has been built more than once on GunPartPicker.

Counted from real GunPartPicker builds: parts lists people put together while planning to buy.

Checked by the same rules the AR builder runs on every part you add: caliber, frame size, receiver pattern, thread pitch and gas length.

Fit is judged from the specs retailers list, which can be missing or wrong. Confirm with the manufacturer before you buy, and have a qualified gunsmith check any build before you fire it.

How often builders pair the Radical Firearms upper and Radical Firearms barrel

Backed by thousands of qualified builds that have both an upper and a barrel.

Barrels builders put on the Radical Firearms 5.56 Barreled Upper

Share of builds with the Radical Firearms 5.56 Barreled Upper and any barrel

Upper Receivers builders put under the Radical Firearms .450 Bushmaster

Share of builds with the Radical Firearms .450 Bushmaster and any upper

  • Radical Firearms 5.56 Barreled Upper

    Of upper picks
    1.2%
    Median paid
    n/a

  • Radical Firearms .450 Bushmaster

    Of barrel picks
    0.5%
    Median paid
    n/a
How we count ⌄

These shares come from GunPartPicker's build data: real parts lists people put together while planning a purchase, not sales or surveys. A build counts a part only when it is the final pick for its slot, so parts that were swapped out never count. Fit never comes from these numbers; it comes from our compatibility rules alone.

Frequently built with the Radical Firearms upper and Radical Firearms barrel

The part builders pick most often in each slot alongside these two, checked against both. Parts that conflict are left out.

Lower Receiver

Charging Handle

Handguard

Gas Block

Bolt Carrier Group

Trigger

Light

Pistol Grip

Optic

Radical Firearms 5.56 Barreled vs Radical Firearms .450: specs and prices

Radical Firearms 5.56Radical Firearms .450
Best pricen/an/a
Storesn/an/a
AssemblyCompleten/a
PlatformAR-15n/a
Gas System LengthMid-Lengthn/a
Caliber5.56 NATO.450 Bushmaster
Length1620
Gas Systemn/aRifle
Twistn/a1:16
Contourn/aHeavy
Threadn/a5/8x32

Barrels frequently paired with the Radical Firearms 5.56 Barreled Upper

Most picked next to it in real builds. Only parts our rules say fit the Radical Firearms 5.56 Barreled Upper are listed.

Upper Receivers frequently paired with the Radical Firearms .450 Bushmaster

Most picked next to it in real builds. Only parts our rules say fit the Radical Firearms .450 Bushmaster are listed.