Does the Primary Weapon Systems MK1 Mod 2 Pistol work with the Radical Firearms 5.56 Socom Upper?

Primary Weapon Systems Mk1 Mod 2 Complete Pistol Ar-15 Lower Receiver

Lower Receiver

Primary Weapon Systems MK1 Mod 2 Pistol

from $629.95

Radical Firearms 5.56 Socom Complete Ar-15 Upper - Rpr M-Lok Handguard - 16"

Upper Receiver

Radical Firearms 5.56 Socom Upper

from $399.99

Primary Weapon Systems lower and Radical Firearms upper compatibility

Yes, they fit

The Primary Weapon Systems MK1 Mod 2 Pistol works with the Radical Firearms 5.56 Socom Upper. Our compatibility rules found no conflict between them.

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 Primary Weapon Systems lower and Radical Firearms upper

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

Lower Receivers builders put under the Radical Firearms 5.56 Socom Upper

Share of builds with the Radical Firearms 5.56 Socom Upper and any lower

  • Primary Weapon Systems MK1 Mod 2 Pistol

    Not in enough builds yet to report.

  • Radical Firearms 5.56 Socom Upper

    Of upper picks
    1.3%
    Median paid
    $400
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 Primary Weapon Systems lower and Radical Firearms upper

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

Charging Handle

Trigger

Bolt Carrier Group

Stock & Brace

Pistol Grip

Light

Primary Weapon Systems MK1 Mod vs Radical Firearms 5.56 Socom: specs and prices

Primary Weapon Systems MK1Radical Firearms 5.56 Socom
Best price$629.95 at BattleHawk Armory$399.99 at Primary Arms
Stores0 of 1 in stock1 of 1 in stock
AssemblyStrippedComplete
PlatformAR-15AR-15
Trigger Pin.154n/a
FinishHardcoat Anodizedn/a
Calibern/a5.56 NATO
Lengthn/a16

Both for $1029.94 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.

Primary Weapon Systems MK1 Mod 2 Pistol

  • BattleHawk Armoryout of stock$629.95

Radical Firearms 5.56 Socom Upper

Price history, last 90 days

  • Radical Firearms 5.56 Socom Upper: lowest $399.99 on Jul 6, highest $399.99 on Jul 6 over the last 90 days.

Upper Receivers most paired with Primary Weapon Systems lowers

The Primary Weapon Systems MK1 Mod 2 Pistol is not in enough builds yet, so these are the most picked next to any Primary Weapon Systems lower. Only parts our rules say fit the Primary Weapon Systems MK1 Mod 2 Pistol are listed.

Lower Receivers frequently paired with the Radical Firearms 5.56 Socom Upper

Most picked next to it in real builds. Only parts our rules say fit the Radical Firearms 5.56 Socom Upper are listed.