Does the CMMG MK4 .223 Remington AR Lower work with the KAK BCG 556 K-SPEC FDE DE?

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

Lower Receiver

CMMG MK4 .223 Remington AR Lower

from $100.02

KAK AR15 BCG M16 556 K-SPEC FDE DE

Bolt Carrier Group

KAK BCG 556 K-SPEC FDE DE

from $215.99

CMMG lower and KAK Industry bolt carrier group compatibility

Yes, they fit

The CMMG MK4 .223 Remington AR Lower works with the KAK BCG 556 K-SPEC FDE DE. 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 KAK Industry bolt carrier group

Backed by thousands of qualified builds that have both a lower and a bolt carrier group.

Bolt Carrier Groups builders put on the CMMG MK4 .223 Remington AR Lower

Share of builds with the CMMG MK4 .223 Remington AR Lower and any bolt carrier group

Lower Receivers builders put under the KAK BCG 556 K-SPEC FDE DE

Share of builds with the KAK BCG 556 K-SPEC FDE DE and any lower

  • CMMG MK4 .223 Remington AR Lower

    Of lower picks
    0.3%
    Median paid
    $99

  • KAK BCG 556 K-SPEC FDE DE

    Of bolt carrier group picks
    0%
    Median paid
    $189
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 KAK Industry bolt carrier group

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

Stock & Brace

Light

Trigger

Charging Handle

Pistol Grip

Upper Receiver

Gas Block

Handguard

Barrel

Optic

CMMG MK4 .223 Remington AR vs KAK BCG 556 K-SPEC FDE DE: specs and prices

CMMG MK4 .223 Remington ARKAK BCG 556 K-SPEC FDE DE
Best price$100.02 at Classic Firearms$215.99 at Optics Planet
Stores3 of 7 in stock0 of 3 in stock
AssemblyStrippedn/a
PlatformAR-15n/a
Caliber5.56 NATOn/a
FinishCerakoten/a
ColorBlackn/a
Cartridgen/a5.56 NATO

Both for $316.01 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

KAK BCG 556 K-SPEC FDE DE

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.
  • KAK BCG 556 K-SPEC FDE DE: lowest $215.99 on Jul 5, highest $216.99 on Jul 12 over the last 90 days.

Bolt Carrier Groups 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 KAK BCG 556 K-SPEC FDE DE

Most picked next to it in real builds. Only parts our rules say fit the KAK BCG 556 K-SPEC FDE DE are listed.