Does the Rock River Arms Completed Operator ETR work with the Magnum Research WMD Guns .308 w/o Hammer?
Upper Receiver
Rock River Arms Completed Operator ETR .308/7.62x51mm 16
from $779.99
Bolt Carrier Group
Magnum Research WMD Guns .308 w/o Hammer NIB-X DPMS
from $233.10
Rock River Arms upper and Magnum Research bolt carrier group compatibility
Yes, they fit
The Rock River Arms Completed Operator ETR works with the Magnum Research WMD Guns .308 w/o Hammer NIB-X. 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 Magnum Research bolt carrier group
Backed by thousands of qualified builds that have both an upper and a bolt carrier group.
Share of builds with the Magnum Research WMD Guns .308 w/o Hammer and any upper
- This pairRock River Arms Completed Operator ETR3%
Rock River Arms Completed Operator ETR
Not in enough builds yet to report.
Magnum Research WMD Guns .308 w/o Hammer
- Of bolt carrier group picks
- 0.3%
- Median paid
- $233
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 Magnum Research bolt carrier group
The part builders pick most often in each slot alongside these two, checked against both. Parts that conflict are left out.
Charging Handle
Unconfirmed
Suppressor
Handguard
Wilson Combat AR .308 T.R.I.M Rails M-LOK
Unconfirmed
Stock & Brace
Rock River Arms Completed vs Magnum Research WMD Guns .308: specs and prices
| Rock River Arms Completed | Magnum Research WMD Guns | |
|---|---|---|
| Best price | $779.99 at Optics Planet | $233.10 at BattleHawk Armory |
| Stores | 0 of 1 in stock | 3 of 3 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 |
| Style | n/a | Billet |
| Finish | n/a | Nickel Boron |
Both for $1013.09 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.
- Magnum Research WMD Guns .308 w/o Hammer: lowest $233.10 on Jul 5, highest $233.99 on Jul 12 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 Magnum Research WMD Guns .308 w/o Hammer
Most picked next to it in real builds. Only parts our rules say fit the Magnum Research WMD Guns .308 w/o Hammer are listed.
