Does the CMMG MK/4 Armor work with the Battle Arms Development 9mm BCG?
Upper Receiver
CMMG MK/4 Armor
from $130.55
Bolt Carrier Group
Battle Arms Development 9mm BCG
from $169.95
CMMG upper and Battle Arms Development bolt carrier group compatibility
Yes, they fit
The CMMG MK/4 Armor works with the Battle Arms Development 9mm BCG. Our compatibility rules found no conflict between them.
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 CMMG upper and Battle Arms Development bolt carrier group
Backed by thousands of qualified builds that have both an upper and a bolt carrier group.
Share of builds with the CMMG MK/4 Armor and any bolt carrier group
- Battle Arms14%
Share of builds with the Battle Arms Development 9mm BCG and any upper
CMMG MK/4 Armor
- Of upper picks
- 0.1%
- Median paid
- $130
Battle Arms Development 9mm BCG
- Of bolt carrier group picks
- 0%
- Median paid
- $170
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 CMMG upper and Battle Arms Development 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
Fits both
Lower Receiver
Fits, check note
Muzzle Device
Rifle Scope
Stock & Brace
Handguard
Fits both
Suppressor
Pistol Grip
CMMG MK/4 Armor vs Battle Arms Development 9mm: specs and prices
| CMMG MK/4 Armor | Battle Arms Development 9mm | |
|---|---|---|
| Best price | $134.99 at Palmetto State Armory | $186.49 at Optics Planet |
| Stores | 2 of 3 in stock | 1 of 6 in stock |
| Assembly | Stripped | n/a |
| Platform | AR-15 | n/a |
| Cartridge | n/a | 9mm |
| Finish | n/a | Nitride |
Both for $321.48 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
- CMMG MK/4 Armor: lowest $130.55 on Jul 5, highest $144.79 on Jul 24 over the last 90 days.
- Battle Arms Development 9mm BCG: lowest $158.06 on Aug 4, highest $186.49 on Sep 25 over the last 90 days.
Bolt Carrier Groups frequently paired with the CMMG MK/4 Armor
Most picked next to it in real builds. Only parts our rules say fit the CMMG MK/4 Armor are listed.
Upper Receivers frequently paired with the Battle Arms Development 9mm BCG
Most picked next to it in real builds. Only parts our rules say fit the Battle Arms Development 9mm BCG are listed.
