Does the Griffin Armament MK2 Stripped work with the Fortis Billet M4 Upper Stripped?

Griffin Armament MK2 Ambi Stripped AR-15 Lower Receiver - Ambidextrous Controls - Flared Magwell - Anodized Black - MK2AL

Lower Receiver

Griffin Armament MK2 Stripped

from $208.95

Fortis Billet M4 Upper Stripped for AR15 223 Rem, 556 NATO - UBilletM4

Upper Receiver

Fortis Billet M4 Upper Stripped

from $189.95

Griffin Armament lower and Fortis Manufacturing upper compatibility

Yes, they fit

The Griffin Armament MK2 Stripped works with the Fortis Billet M4 Upper Stripped. 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 Griffin Armament lower and Fortis Manufacturing upper

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

Upper Receivers builders put on the Griffin Armament MK2 Stripped

Share of builds with the Griffin Armament MK2 Stripped and any upper

Lower Receivers builders put under the Fortis Billet M4 Upper Stripped

Share of builds with the Fortis Billet M4 Upper Stripped and any lower

  • Griffin Armament MK2 Stripped

    Of lower picks
    1.3%
    Median paid
    $209

  • Fortis Billet M4 Upper Stripped

    Of upper picks
    0.1%
    Median paid
    $167
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 Griffin Armament lower and Fortis Manufacturing upper

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

Trigger

Bolt Carrier Group

Pistol Grip

Charging Handle

Stock & Brace

Gas Block

Optic

Handguard

Griffin Armament MK2 Stripped vs Fortis Billet M4 Upper: specs and prices

Griffin Armament MK2Fortis Billet M4 Upper
Best price$209.00 at MidwayUSA$189.95 at Optics Planet
Stores3 of 5 in stock4 of 5 in stock
AssemblyStrippedStripped
PlatformAR-15AR-15
CaliberMulti.223 Wylde
FinishHardcoat Anodizedn/a
ColorBlackn/a
Receiver Typen/aBillet

Both for $398.95 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.

Griffin Armament MK2 Stripped

Fortis Billet M4 Upper Stripped

Price history, last 90 days

  • Griffin Armament MK2 Stripped: lowest $189.99 on Aug 24, highest $219.00 on Jul 18 over the last 90 days.
  • Fortis Billet M4 Upper Stripped: lowest $167.16 on Jul 5, highest $210.99 on Sep 27 over the last 90 days.

Upper Receivers frequently paired with the Griffin Armament MK2 Stripped

Most picked next to it in real builds. Only parts our rules say fit the Griffin Armament MK2 Stripped are listed.

Lower Receivers frequently paired with the Fortis Billet M4 Upper Stripped

Most picked next to it in real builds. Only parts our rules say fit the Fortis Billet M4 Upper Stripped are listed.