Does the KE Arms Kp-15 Polymer work with the CMMG MK/4 Armor?

Ar-15 Kp-15 Complete Lower Receivers Mil-Spec Polymer - Ar-15 Kp-15 Complete Lower Receiver Mil-Spec Polymer Blk

Lower Receiver

KE Arms Kp-15 Polymer

from $179.96

CMMG MK/4 AR-15 Upper Receiver Assembly Armor Black

Upper Receiver

CMMG MK/4 Armor

from $130.55

KE Arms lower and CMMG upper compatibility

Yes, they fit

The KE Arms Kp-15 Polymer works with the CMMG MK/4 Armor. 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 KE Arms 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 KE Arms Kp-15 Polymer

Share of builds with the KE Arms Kp-15 Polymer and any upper

Lower Receivers builders put under the CMMG MK/4 Armor

Share of builds with the CMMG MK/4 Armor and any lower

  • KE Arms Kp-15 Polymer

    Of lower picks
    0.1%
    Median paid
    n/a

  • CMMG MK/4 Armor

    Of upper picks
    0.1%
    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 KE Arms 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.

Bolt Carrier Group

Charging Handle

Muzzle Device

Gas Block

Rifle Scope

Stock & Brace

Barrel

Handguard

Optic

Trigger

Suppressor

Pistol Grip

KE Arms Kp-15 Polymer vs CMMG MK/4 Armor: specs and prices

KE Arms Kp-15 PolymerCMMG MK/4 Armor
Best price$179.96 at AT3 Tactical$134.99 at Palmetto State Armory
Stores1 of 4 in stock2 of 3 in stock
AssemblyCompleteStripped
PlatformAR-15AR-15
CaliberMultin/a
ColorBlackn/a

Both for $314.95 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.

KE Arms Kp-15 Polymer

CMMG MK/4 Armor

Price history, last 90 days

  • KE Arms Kp-15 Polymer: lowest $179.96 on Jul 5, highest $219.99 on Jul 11 over the last 90 days.
  • CMMG MK/4 Armor: lowest $130.55 on Jul 5, highest $144.79 on Jul 24 over the last 90 days.

Upper Receivers frequently paired with the KE Arms Kp-15 Polymer

Most picked next to it in real builds. Only parts our rules say fit the KE Arms Kp-15 Polymer are listed.

Lower Receivers frequently paired with the CMMG MK/4 Armor

Most picked next to it in real builds. Only parts our rules say fit the CMMG MK/4 Armor are listed.