Does the Proof Research 6mm ARC AR-Type work with the FailZero Fail Zero 6.5 Grendel Type II?

Proof Research 6mm Arc Ar-Type Ar-15 Barrel - Rifle Length - Stainless Steel - .750" - 18"

Barrel

Proof Research 6mm ARC AR-Type

from $574.99

Fail Zero 6.5 Grendel Type Ii Ar-15 Bolt Carrier Group - No Hammer

Bolt Carrier Group

FailZero Fail Zero 6.5 Grendel Type II

from $144.51

Proof Research barrel and FailZero bolt carrier group compatibility

Yes, they fit

The Proof Research 6mm ARC AR-Type works with the FailZero Fail Zero 6.5 Grendel Type II. 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 Proof Research barrel and FailZero bolt carrier group

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

Bolt Carrier Groups builders put on the Proof Research 6mm ARC AR-Type

Share of builds with the Proof Research 6mm ARC AR-Type and any bolt carrier group

Barrels builders put under the FailZero Fail Zero 6.5 Grendel Type II

Share of builds with the FailZero Fail Zero 6.5 Grendel Type II and any barrel

  • Proof Research 6mm ARC AR-Type

    Of barrel picks
    0.5%
    Median paid
    $578

  • FailZero Fail Zero 6.5 Grendel Type II

    Of bolt carrier group picks
    0.1%
    Median paid
    $151
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 Proof Research barrel and FailZero bolt carrier group

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

Upper Receiver

Trigger

Handguard

Charging Handle

Pistol Grip

Lower Receiver

Buffer

Gas Block

Muzzle Device

Buffer Tube Assembly

Suppressor

Light

Proof Research 6mm ARC AR-Type vs FailZero Fail Zero 6.5 Grendel: specs and prices

Proof Research 6mm ARCFailZero Fail Zero 6.5
Best price$574.99 at Ammunition Depot$144.51 at BattleHawk Armory
Stores5 of 6 in stock5 of 6 in stock
Caliber6mm ARCn/a
Gas SystemRiflen/a
Length18n/a
Twist1:7 5Rn/a
ContourSPRn/a
Thread5/8x24n/a
Cartridgen/a6.5 Grendel
Stylen/aM16 Bolt Carrier
Finishn/aNickel Boron
Weight2.14n/a

Both for $719.50 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.

Proof Research 6mm ARC AR-Type

FailZero Fail Zero 6.5 Grendel Type II

Price history, last 90 days

  • Proof Research 6mm ARC AR-Type: lowest $493.49 on Aug 10, highest $649.99 on Sep 27 over the last 90 days.
  • FailZero Fail Zero 6.5 Grendel Type II: lowest $140.70 on Jul 5, highest $190.99 on Aug 4 over the last 90 days.

Bolt Carrier Groups frequently paired with the Proof Research 6mm ARC AR-Type

Most picked next to it in real builds. Only parts our rules say fit the Proof Research 6mm ARC AR-Type are listed.

Barrels frequently paired with the FailZero Fail Zero 6.5 Grendel Type II

Most picked next to it in real builds. Only parts our rules say fit the FailZero Fail Zero 6.5 Grendel Type II are listed.