Does the CMMG MK4 .223 Remington AR Lower work with the Radical Firearms 5.56 Socom Barreled?

CMMG MK4 .223 Remington AR Lower, Black - 55CA102AB

Lower Receiver

CMMG MK4 .223 Remington AR Lower

from $100.02

Radical Firearms 5.56 Socom Ar-15 Barreled Upper - Mhr Handguard - 16"

Upper Receiver

Radical Firearms 5.56 Socom Barreled Upper

CMMG lower and Radical Firearms upper compatibility

Yes, they fit

The CMMG MK4 .223 Remington AR Lower works with the Radical Firearms 5.56 Socom Barreled Upper. Our compatibility rules found no conflict between them.

This exact setup is in a real GunPartPicker build.

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 CMMG lower and Radical Firearms upper

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

Upper Receivers builders put on the CMMG MK4 .223 Remington AR Lower

Share of builds with the CMMG MK4 .223 Remington AR Lower and any upper

Lower Receivers builders put under the Radical Firearms 5.56 Socom Barreled

Share of builds with the Radical Firearms 5.56 Socom Barreled and any lower

  • CMMG MK4 .223 Remington AR Lower

    Of lower picks
    0.3%
    Median paid
    $99

  • Radical Firearms 5.56 Socom Barreled

    Of upper picks
    0.1%
    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 CMMG lower and Radical Firearms upper

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

Bolt Carrier Group

Charging Handle

Stock & Brace

Light

Trigger

Handguard

Pistol Grip

Gas Block

Barrel

CMMG MK4 .223 Remington AR vs Radical Firearms 5.56 Socom: specs and prices

CMMG MK4 .223 Remington ARRadical Firearms 5.56 Socom
Best price$100.02 at Classic Firearmsn/a
Stores3 of 7 in stockn/a
AssemblyStrippedComplete
PlatformAR-15AR-15
Caliber5.56 NATO5.56 NATO
FinishCerakoten/a
ColorBlackn/a
Gas System Lengthn/aMid-Length
Lengthn/a16

Today's best prices and 90 day price history

Every store we track for each part, cheapest in stock first. Prices are checked through the day.

CMMG MK4 .223 Remington AR Lower

Radical Firearms 5.56 Socom Barreled Upper

No store lists it today.

Price history, last 90 days

  • CMMG MK4 .223 Remington AR Lower: lowest $94.69 on Jul 15, highest $126.99 on Jul 11 over the last 90 days.

Upper Receivers frequently paired with the CMMG MK4 .223 Remington AR Lower

Most picked next to it in real builds. Only parts our rules say fit the CMMG MK4 .223 Remington AR Lower are listed.

Lower Receivers frequently paired with the Radical Firearms 5.56 Socom Barreled

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