Does the CMMG MK9 Stripped Lower 9mm work with the FailZero AR9?

CMMG MK9 Stripped Lower 9mm with Colt Pattern Magwell

Lower Receiver

CMMG MK9 Stripped Lower 9mm

from $155.78

FailZero AR9, 9mm BCG, Black Nitride

Bolt Carrier Group

FailZero AR9

from $132.03

CMMG lower and FailZero bolt carrier group compatibility

Yes, they fit

The CMMG MK9 Stripped Lower 9mm works with the FailZero AR9. 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 FailZero 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 MK9 Stripped Lower 9mm

Share of builds with the CMMG MK9 Stripped Lower 9mm and any bolt carrier group

Lower Receivers builders put under the FailZero AR9

Share of builds with the FailZero AR9 and any lower

  • CMMG MK9 Stripped Lower 9mm

    Of lower picks
    0%
    Median paid
    $149

  • FailZero AR9

    Of bolt carrier group picks
    0.3%
    Median paid
    $131
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 FailZero bolt carrier group

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

Charging Handle

Trigger

Upper Receiver

Stock & Brace

Pistol Grip

Optic

Suppressor

Barrel

CMMG MK9 Stripped Lower 9mm vs FailZero AR9: specs and prices

CMMG MK9 Stripped Lower 9mmFailZero AR9
Best price$174.95 at CMMG$132.03 at BattleHawk Armory
Stores1 of 2 in stock4 of 4 in stock
AssemblyStrippedn/a
PlatformAR-9n/a
Caliber9mmn/a
Cartridgen/a9mm
Stylen/aPistol Caliber Blow Back Carrier
Finishn/aNitride

Both for $306.98 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 MK9 Stripped Lower 9mm

FailZero AR9

Price history, last 90 days

  • CMMG MK9 Stripped Lower 9mm: lowest $155.78 on Jul 5, highest $174.95 on Jul 17 over the last 90 days.
  • FailZero AR9: lowest $132.03 on Jul 5, highest $179.99 on Aug 28 over the last 90 days.

Bolt Carrier Groups frequently paired with the CMMG MK9 Stripped Lower 9mm

Most picked next to it in real builds. Only parts our rules say fit the CMMG MK9 Stripped Lower 9mm are listed.

Lower Receivers frequently paired with the FailZero AR9

Most picked next to it in real builds. Only parts our rules say fit the FailZero AR9 are listed.