Does the Daniel Defense M4A1 FSP 5.56x45mm work with the KAK Industry K-SPEC BCG w/Side Vent?

M4A1 FSP 5.56x45mm 14.5"BBL Stripped Upper W/12.25"Handguard

Upper Receiver

Daniel Defense M4A1 FSP 5.56x45mm 14.5"BBL Stripped Upper

from $899.99

K-SPEC M16 BCG w/Side Vent 5.56X45mm NATO Full Chrome

Bolt Carrier Group

KAK Industry K-SPEC BCG w/Side Vent 5.56X45mm NATO Full

from $187.49

Daniel Defense upper and KAK Industry bolt carrier group compatibility

Yes, they fit

The Daniel Defense M4A1 FSP 5.56x45mm 14.5"BBL works with the KAK Industry K-SPEC BCG w/Side Vent 5.56X45mm. 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 Daniel Defense upper and KAK Industry bolt carrier group

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

Bolt Carrier Groups builders put on the Daniel Defense M4A1 FSP 5.56x45mm

Share of builds with the Daniel Defense M4A1 FSP 5.56x45mm and any bolt carrier group

Upper Receivers builders put under the KAK Industry K-SPEC BCG w/Side Vent

Share of builds with the KAK Industry K-SPEC BCG w/Side Vent and any upper

  • Daniel Defense M4A1 FSP 5.56x45mm

    Of upper picks
    0%
    Median paid
    $825

  • KAK Industry K-SPEC BCG w/Side Vent

    Of bolt carrier group picks
    0.1%
    Median paid
    $220
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 Daniel Defense upper 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.

Charging Handle

Trigger

Lower Receiver

Light

Rifle Scope

Stock & Brace

Pistol Grip

Gas Block

Suppressor

Handguard

Barrel

Daniel Defense M4A1 FSP vs KAK Industry K-SPEC BCG w/Side: specs and prices

Daniel Defense M4A1 FSPKAK Industry K-SPEC BCG
Best price$899.99 at Brownells$187.49 at Ammunition Depot
Stores1 of 1 in stock2 of 5 in stock
AssemblyCompleten/a
PlatformAR-15n/a
Caliber5.56 NATOn/a
Receiver TypeM4n/a
Length14.5n/a
Cartridgen/a5.56 NATO
Finishn/aChrome

Both for $1087.48 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.

Daniel Defense M4A1 FSP 5.56x45mm 14.5"BBL

KAK Industry K-SPEC BCG w/Side Vent 5.56X45mm

Price history, last 90 days

  • Daniel Defense M4A1 FSP 5.56x45mm: lowest $749.99 on Jul 6, highest $899.99 on Jul 14 over the last 90 days.
  • KAK Industry K-SPEC BCG w/Side Vent: lowest $179.99 on Jul 5, highest $244.99 on Sep 3 over the last 90 days.

Bolt Carrier Groups frequently paired with the Daniel Defense M4A1 FSP 5.56x45mm

Most picked next to it in real builds. Only parts our rules say fit the Daniel Defense M4A1 FSP 5.56x45mm are listed.

Upper Receivers frequently paired with the KAK Industry K-SPEC BCG w/Side Vent

Most picked next to it in real builds. Only parts our rules say fit the KAK Industry K-SPEC BCG w/Side Vent are listed.