Does the PSA Lower 300BO work with the CMMG MK4 .300BLK Banshee Upper Group?

PSA Complete Lower 300BO, JAKL, MOE EPT w/o Brace, Smoke

Lower Receiver

PSA Lower 300BO

from $249.99

CMMG Mk4 .300BLK Banshee Upper Group Receiver 8in 1-7 Twist 5/8 X 24 TPI 16.5in Armor Black

Upper Receiver

CMMG MK4 .300BLK Banshee Upper Group Receiver 8in 1-7 Twist

from $660.23

Palmetto State Armory lower and CMMG upper compatibility

Yes, they fit

The PSA Lower 300BO works with the CMMG MK4 .300BLK Banshee Upper Group Receiver. 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 Palmetto State Armory 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 PSA Lower 300BO

Share of builds with the PSA Lower 300BO and any upper

Lower Receivers builders put under the CMMG MK4 .300BLK Banshee Upper Group

Share of builds with the CMMG MK4 .300BLK Banshee Upper Group and any lower

  • PSA Lower 300BO

    Of lower picks
    0.3%
    Median paid
    $250

  • CMMG MK4 .300BLK Banshee Upper Group

    Of upper picks
    0.1%
    Median paid
    $657
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 Palmetto State Armory 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

Light

Stock & Brace

Trigger

Suppressor

Optic

PSA Lower 300BO vs CMMG MK4 .300BLK Banshee Upper: specs and prices

PSA Lower 300BOCMMG MK4 .300BLK Banshee
Best price$249.99 at Palmetto State Armory$789.99 at Optics Planet
Stores1 of 1 in stock1 of 2 in stock
AssemblyCompleteComplete
PlatformAR-15AR-15
Caliber300 Blackout300 Blackout
Trigger Pin.154n/a
FinishCerakoten/a
Lengthn/a8

Both for $1039.98 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.

PSA Lower 300BO

CMMG MK4 .300BLK Banshee Upper Group Receiver

Price history, last 90 days

  • PSA Lower 300BO: lowest $237.49 on Jul 12, highest $249.99 on Jul 14 over the last 90 days.
  • CMMG MK4 .300BLK Banshee Upper Group: lowest $660.23 on Jul 5, highest $789.99 on Jul 12 over the last 90 days.

Upper Receivers frequently paired with the PSA Lower 300BO

Most picked next to it in real builds. Only parts our rules say fit the PSA Lower 300BO are listed.

Lower Receivers frequently paired with the CMMG MK4 .300BLK Banshee Upper Group

Most picked next to it in real builds. Only parts our rules say fit the CMMG MK4 .300BLK Banshee Upper Group are listed.