Does the Rain Ordnance BRO-22 Receiver .22 LR work with the CMMG MK4/ Forward Assist Armor?
Lower Receiver
Rain Ordnance BRO-22 Receiver .22 LR Billet Lower
from $106.10
Upper Receiver
CMMG MK4/ Forward Assist Armor
from $115.27
Black Rain Ordnance lower and CMMG upper compatibility
Yes, they fit
The Rain Ordnance BRO-22 Receiver .22 LR Billet works with the CMMG MK4/ Forward Assist Armor. Our compatibility rules found no conflict between them.
No one has built this exact setup yet, but Black Rain Ordnance lowers with CMMG uppers are a common pairing.
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 Black Rain Ordnance lower and CMMG upper
Backed by tens of thousands of qualified builds that have both a lower and an upper.
Share of builds with the Rain Ordnance BRO-22 Receiver .22 LR and any upper
Share of builds with the CMMG MK4/ Forward Assist Armor and any lower
Rain Ordnance BRO-22 Receiver .22 LR
- Of lower picks
- 0.1%
- Median paid
- $106
CMMG MK4/ Forward Assist Armor
- Of upper picks
- 0%
- Median paid
- $115
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 Black Rain Ordnance lower and CMMG upper
The part builders pick most often in each slot alongside these two, checked against both. Parts that conflict are left out.
Bolt Carrier Group
Fits both
Charging Handle
Fits both
Pistol Grip
Barrel
FN America FN 16 Mid-Length 5.56mm
Fits both
Muzzle Device
Stock & Brace
Rain Ordnance BRO-22 Receiver vs CMMG MK4/ Forward Assist Armor: specs and prices
| Rain Ordnance BRO-22 | CMMG MK4/ Forward Assist | |
|---|---|---|
| Best price | $106.10 at Classic Firearms | $115.27 at BattleHawk Armory |
| Stores | 1 of 1 in stock | 0 of 2 in stock |
| Assembly | Stripped | Stripped |
| Platform | AR-15 | AR-15 |
| Caliber | .22 LR | n/a |
| Finish | Hardcoat Anodized | n/a |
| Color | Black | n/a |
| Receiver Type | n/a | A4 |
Both for $221.37 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
- Rain Ordnance BRO-22 Receiver .22 LR: lowest $106.10 on Jul 12, highest $106.10 on Jul 12 over the last 90 days.
- CMMG MK4/ Forward Assist Armor: lowest $115.27 on Jul 5, highest $129.79 on Jul 26 over the last 90 days.
Upper Receivers frequently paired with the Rain Ordnance BRO-22 Receiver .22 LR
Most picked next to it in real builds. Only parts our rules say fit the Rain Ordnance BRO-22 Receiver .22 LR are listed.
Lower Receivers frequently paired with the CMMG MK4/ Forward Assist Armor
Most picked next to it in real builds. Only parts our rules say fit the CMMG MK4/ Forward Assist Armor are listed.
