Does the CMMG MK4 .223 Remington AR Lower work with the Geissele Automatics Geissele 5.56mm?

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

Lower Receiver

CMMG MK4 .223 Remington AR Lower

from $100.02

Geissele Automatics Geissele 5.56mm Reliability Enhanced Bolt Carrier Group & Gas Key 05-2992

Bolt Carrier Group

Geissele Automatics Geissele 5.56mm Reliability Enhanced &

from $148.00

CMMG lower and Geissele bolt carrier group compatibility

Yes, they fit

The CMMG MK4 .223 Remington AR Lower works with the Geissele Automatics Geissele 5.56mm Reliability. Our compatibility rules found no conflict between them.

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 CMMG lower and Geissele 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 Geissele Automatics Geissele 5.56mm

Share of builds with the Geissele Automatics Geissele 5.56mm and any lower

  • CMMG MK4 .223 Remington AR Lower

    Of lower picks
    0.3%
    Median paid
    $99

  • Geissele Automatics Geissele 5.56mm

    Of bolt carrier group picks
    0.2%
    Median paid
    $130
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 Geissele bolt carrier group

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

Trigger

Upper Receiver

Stock & Brace

Barrel

Gas Block

Light

Pistol Grip

Charging Handle

Optic

Muzzle Device

CMMG MK4 .223 Remington AR vs Geissele Automatics Geissele: specs and prices

CMMG MK4 .223 Remington ARGeissele Automatics Geissele
Best price$100.02 at Classic Firearms$148.00 at Primary Arms
Stores3 of 7 in stock1 of 3 in stock
AssemblyStrippedn/a
PlatformAR-15n/a
Caliber5.56 NATOn/a
FinishCerakoten/a
ColorBlackn/a
Cartridgen/a5.56 NATO

Both for $248.02 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

Geissele Automatics Geissele 5.56mm Reliability

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.

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 Geissele Automatics Geissele 5.56mm

Most picked next to it in real builds. Only parts our rules say fit the Geissele Automatics Geissele 5.56mm are listed.