Does the CMMG MK4 .223 Remington AR Lower work with the CMMG Banshee 9mm Upper?

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

Lower Receiver

CMMG MK4 .223 Remington AR Lower

from $100.02

CMMG Banshee 9mm Upper with 5" Barrel, Black - 99B17FDAB

Upper Receiver

CMMG Banshee 9mm Upper

from $716.63

CMMG lower and CMMG upper compatibility

They fit, with a catch

The CMMG MK4 .223 Remington AR Lower works with the CMMG Banshee 9mm Upper, with one thing to check: Lower Receiver (.223 Wylde / 5.56 NATO / Multi) needs a 9mm magazine well adapter for a PCC/9mm build.

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 CMMG 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 CMMG Banshee 9mm Upper

Share of builds with the CMMG Banshee 9mm Upper and any lower

  • CMMG MK4 .223 Remington AR Lower

    Of lower picks
    0.3%
    Median paid
    $99

  • CMMG Banshee 9mm Upper

    Of upper picks
    0%
    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 CMMG upper

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

Stock & Brace

Charging Handle

Light

Trigger

Pistol Grip

Gas Block

Handguard

Optic

CMMG MK4 .223 Remington AR vs CMMG Banshee 9mm Upper: specs and prices

CMMG MK4 .223 Remington ARCMMG Banshee 9mm Upper
Best price$100.02 at Classic Firearms$716.63 at BattleHawk Armory
Stores3 of 7 in stock0 of 1 in stock
AssemblyStrippedComplete
PlatformAR-15AR-9
Caliber5.56 NATO9mm
FinishCerakoten/a
ColorBlackn/a
Gas System Lengthn/aBlowback
Lengthn/a5

Both for $816.65 at today's best prices.

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

CMMG Banshee 9mm Upper

  • BattleHawk Armoryout of stock$716.63

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 CMMG Banshee 9mm Upper

Most picked next to it in real builds. Only parts our rules say fit the CMMG Banshee 9mm Upper are listed.