Does the Smith & Wesson M&P15 Lower work with the Daniel Defense M4A1 FSP 14.50"?

Smith & Wesson M&P15 Complete Lower 5.56x45mm/.223 Remington, Black - 812002

Lower Receiver

Smith & Wesson M&P15 Lower 5.56x45mm/.223 Remington

from $269.99

Daniel Defense M4A1 FSP 14.50" Carbine-Length Upper 5.56x45mm 1:7 Quad Rail with BCG and CH, Flat Dark Earth - Tactical Precision - 2300409376

Upper Receiver

Daniel Defense M4A1 FSP 14.50" Carbine-Length Upper

from $1506.00

Smith & Wesson lower and Daniel Defense upper compatibility

Yes, they fit

The Smith & Wesson M&P15 Lower 5.56x45mm/.223 works with the Daniel Defense M4A1 FSP 14.50" Carbine-Length. Our compatibility rules found no conflict between them.

No one has built this exact setup yet, but Smith & Wesson lowers with Daniel Defense uppers are a common pairing.

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 Smith & Wesson lower and Daniel Defense upper

Backed by tens of thousands of qualified builds that have both a lower and an upper.

Upper Receivers builders put on the Smith & Wesson M&P15 Lower

Share of builds with the Smith & Wesson M&P15 Lower and any upper

Lower Receivers builders put under the Daniel Defense M4A1 FSP 14.50"

Share of builds with the Daniel Defense M4A1 FSP 14.50" and any lower

  • Smith & Wesson M&P15 Lower

    Of lower picks
    4.9%
    Median paid
    $270

  • Daniel Defense M4A1 FSP 14.50"

    Of upper picks
    0%
    Median paid
    $1506
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 Smith & Wesson lower and Daniel Defense upper

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

Trigger

Stock & Brace

Bolt Carrier Group

Optic

Suppressor

Charging Handle

Light

Smith & Wesson M&P15 Lower vs Daniel Defense M4A1 FSP 14.50": specs and prices

Smith & Wesson M&P15 LowerDaniel Defense M4A1 FSP
Best price$339.20 at Classic Firearms$1506.00 at Palmetto State Armory
Stores4 of 6 in stock6 of 6 in stock
AssemblyCompleteComplete
PlatformAR-15AR-15
Caliber5.56 NATO5.56 NATO
ColorBlackn/a
Gas System Lengthn/aCarbine
Lengthn/a14.5

Both for $1845.20 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.

Smith & Wesson M&P15 Lower 5.56x45mm/.223

Daniel Defense M4A1 FSP 14.50" Carbine-Length

Price history, last 90 days

  • Smith & Wesson M&P15 Lower: lowest $269.99 on Jul 11, highest $420.99 on Sep 26 over the last 90 days.
  • Daniel Defense M4A1 FSP 14.50": lowest $1506.00 on Jul 12, highest $1629.00 on Aug 2 over the last 90 days.

Upper Receivers frequently paired with the Smith & Wesson M&P15 Lower

Most picked next to it in real builds. Only parts our rules say fit the Smith & Wesson M&P15 Lower are listed.

Lower Receivers frequently paired with the Daniel Defense M4A1 FSP 14.50"

Most picked next to it in real builds. Only parts our rules say fit the Daniel Defense M4A1 FSP 14.50" are listed.