Does the STERN DEFENSE MOD5 UPPER 9MM 8.5IN BBL work with the Battle Arms Development 9mm BCG?
Upper Receiver
STERN DEFENSE MOD5 UPPER 9MM 8.5IN BBL MLOK RAIL
from $498.56
Bolt Carrier Group
Battle Arms Development 9mm BCG
from $169.95
Stern Defense upper and Battle Arms Development bolt carrier group compatibility
Yes, they fit
The STERN DEFENSE MOD5 UPPER 9MM 8.5IN BBL MLOK RAIL works with the Battle Arms Development 9mm BCG. 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 Stern Defense 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 STERN DEFENSE MOD5 UPPER 9MM 8.5IN BBL and any bolt carrier group
- This pairBattle Arms Development 9mm BCG25%
- FailZero AR925%
Share of builds with the Battle Arms Development 9mm BCG and any upper
- This pairSTERN DEFENSE MOD5 UPPER 9MM 8.5IN BBL MLOK RAIL33%
STERN DEFENSE MOD5 UPPER 9MM 8.5IN BBL
- Of upper picks
- 0%
- Median paid
- $499
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 Stern Defense 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.
Handguard
Charging Handle
Fits both
Lower Receiver
Unconfirmed
STERN DEFENSE MOD5 UPPER 9MM vs Battle Arms Development 9mm: specs and prices
| STERN DEFENSE MOD5 UPPER 9MM | Battle Arms Development 9mm | |
|---|---|---|
| Best price | $498.56 at BattleHawk Armory | $186.49 at Optics Planet |
| Stores | 1 of 1 in stock | 1 of 6 in stock |
| Assembly | Complete | n/a |
| Platform | AR-9 | n/a |
| Caliber | 9mm | n/a |
| Length | 8.5 | n/a |
| Cartridge | n/a | 9mm |
| Finish | n/a | Nitride |
Both for $685.05 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
- STERN DEFENSE MOD5 UPPER 9MM 8.5IN BBL: lowest $498.56 on Jul 5, highest $498.56 on Jul 5 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 STERN DEFENSE MOD5 UPPER 9MM 8.5IN BBL
Most picked next to it in real builds. Only parts our rules say fit the STERN DEFENSE MOD5 UPPER 9MM 8.5IN BBL are listed.
Upper Receivers most paired with Battle Arms Development bolt carrier groups
The Battle Arms Development 9mm BCG is not in enough builds yet, so these are the most picked next to any Battle Arms Development bolt carrier group. Only parts our rules say fit the Battle Arms Development 9mm BCG are listed.
