Does the Spike's Tactical Spider 9mm Lower work with the Stern Defense SD 4in MOD4 M-LOK 4in?

Spike's Tactical Spider 9mm Ar-15 Lower for Glock Magazines (Non Ca Compliant)

Lower Receiver

Spike's Tactical Spider 9mm Lower

from $161.10

Stern Defense SD 4in Mod4 M-Lok 4in Barrel 9mm Black Complete Upper Receiver Black SDINBRLKK

Upper Receiver

Stern Defense SD 4in MOD4 M-LOK 4in Barrel 9mm SDINBRLKK

from $419.27

Spike's Tactical lower and Stern Defense upper compatibility

Yes, they fit

The Spike's Tactical Spider 9mm Lower works with the Stern Defense SD 4in MOD4 M-LOK 4in Barrel 9mm. 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 Spike's Tactical lower and Stern Defense upper

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

Upper Receivers builders put on the Spike's Tactical Spider 9mm Lower

Share of builds with the Spike's Tactical Spider 9mm Lower and any upper

Lower Receivers builders put under the Stern Defense SD 4in MOD4 M-LOK 4in

Share of builds with the Stern Defense SD 4in MOD4 M-LOK 4in and any lower

  • Spike's Tactical Spider 9mm Lower

    Of lower picks
    0.1%
    Median paid
    $161

  • Stern Defense SD 4in MOD4 M-LOK 4in

    Of upper picks
    0%
    Median paid
    $419
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 Spike's Tactical lower and Stern Defense 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

Stock & Brace

Trigger

Pistol Grip

Charging Handle

Barrel

Optic

Suppressor

Muzzle Device

Spike's Tactical Spider 9mm vs Stern Defense SD 4in MOD4: specs and prices

Spike's Tactical Spider 9mmStern Defense SD 4in MOD4
Best price$161.10 at Primary Arms$419.27 at Optics Planet
Stores0 of 6 in stock1 of 1 in stock
AssemblyStrippedComplete
PlatformAR-9AR-9
Caliber9mm9mm
Trigger Pin.154n/a
FinishHardcoat Anodizedn/a
Lengthn/a4
Weight13.9n/a

Both for $580.37 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.

Spike's Tactical Spider 9mm Lower

  • Primary Armsout of stock$161.10
  • Classic Firearmsout of stock$161.10
  • BattleHawk Armoryout of stock$161.10
  • AT3 Tacticalout of stock$161.10
  • KY Gun Companyout of stock$161.10
  • Sportsmans Outdoor Superstoreout of stock$199.99

Stern Defense SD 4in MOD4 M-LOK 4in Barrel 9mm

Price history, last 90 days

  • Spike's Tactical Spider 9mm Lower: lowest $161.10 on Jul 5, highest $199.99 on Jul 30 over the last 90 days.
  • Stern Defense SD 4in MOD4 M-LOK 4in: lowest $376.96 on Jul 5, highest $419.27 on Jul 12 over the last 90 days.

Upper Receivers frequently paired with the Spike's Tactical Spider 9mm Lower

Most picked next to it in real builds. Only parts our rules say fit the Spike's Tactical Spider 9mm Lower are listed.

Lower Receivers frequently paired with the Stern Defense SD 4in MOD4 M-LOK 4in

Most picked next to it in real builds. Only parts our rules say fit the Stern Defense SD 4in MOD4 M-LOK 4in are listed.