Does the Rock River Arms Completed Operator ETR work with the FailZero AR10 EXO Nickel Boron Coated?
Upper Receiver
Rock River Arms Completed Operator ETR .308/7.62x51mm 16
from $779.99
Bolt Carrier Group
FailZero AR10 EXO Nickel Boron Coated
from $207.49
Rock River Arms upper and FailZero bolt carrier group compatibility
Yes, they fit
The Rock River Arms Completed Operator ETR works with the FailZero AR10 EXO Nickel Boron Coated. 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 Rock River Arms upper and FailZero bolt carrier group
Backed by thousands of qualified builds that have both an upper and a bolt carrier group.
Share of builds with the FailZero AR10 EXO Nickel Boron Coated and any upper
- This pairRock River Arms Completed Operator ETR7%
Rock River Arms Completed Operator ETR
Not in enough builds yet to report.
FailZero AR10 EXO Nickel Boron Coated
- Of bolt carrier group picks
- 0.1%
- Median paid
- $207
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 Rock River Arms upper 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.
Suppressor
Charging Handle
Fits both
Barrel
FAXON Firearms Match .308 Win 18"
Fits both
Trigger
Lower Receiver
Stock & Brace
Pistol Grip
Muzzle Device
Rifle Scope
Rock River Arms Completed vs FailZero AR10 EXO Nickel Boron: specs and prices
| Rock River Arms Completed | FailZero AR10 EXO Nickel | |
|---|---|---|
| Best price | $779.99 at Optics Planet | $207.49 at BattleHawk Armory |
| Stores | 0 of 1 in stock | 3 of 4 in stock |
| Assembly | Complete | n/a |
| Platform | AR-10 | n/a |
| Gas System Length | Mid-Length | n/a |
| Caliber | .308 Win | n/a |
| Length | 16 | n/a |
| Cartridge | n/a | .308 Win |
| Finish | n/a | Nickel Boron |
Both for $987.48 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.
Price history, last 90 days
- Rock River Arms Completed Operator ETR: lowest $749.99 on Aug 18, highest $789.99 on Jul 5 over the last 90 days.
- FailZero AR10 EXO Nickel Boron Coated: lowest $207.49 on Jul 5, highest $269.99 on Jul 7 over the last 90 days.
Bolt Carrier Groups frequently paired with the Rock River Arms Completed Operator ETR
Most picked next to it in real builds. Only parts our rules say fit the Rock River Arms Completed Operator ETR are listed.
Upper Receivers frequently paired with the FailZero AR10 EXO Nickel Boron Coated
Most picked next to it in real builds. Only parts our rules say fit the FailZero AR10 EXO Nickel Boron Coated are listed.
