Does the Foxtrot Mike Products FM9 Premium 9mm work with the Stern Defense SD-BU45 Bolt Carrier?
Lower Receiver
Foxtrot Mike Products FM9 Premium 9mm
from $275.00
Bolt Carrier Group
Stern Defense SD-BU45 Bolt Carrier .45ACP
from $150.65
Foxtrot Mike Products lower and Stern Defense bolt carrier group compatibility
Yes, they fit
The Foxtrot Mike Products FM9 Premium 9mm works with the Stern Defense SD-BU45 Bolt Carrier .45ACP. Our compatibility rules found no conflict between them.
No one has built this exact setup yet, but Foxtrot Mike Products lowers with Stern Defense bolt carrier groups 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 Foxtrot Mike Products lower and Stern Defense bolt carrier group
Backed by thousands of qualified builds that have both a lower and a bolt carrier group.
Share of builds with the Foxtrot Mike Products FM9 Premium 9mm and any bolt carrier group
- FAXON Chameleon 5.56 NitrideDoes not fit12%
- Aero Precision 5.56 BCG W/C158 BoltDoes not fit10%
- PSA Custom Fathers of Freedom 5.56 Full AutoDoes not fit8%
Foxtrot Mike Products FM9 Premium 9mm
- Of lower picks
- 1.3%
- Median paid
- $275
Stern Defense SD-BU45 Bolt Carrier
Not in enough builds yet to report.
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 Foxtrot Mike Products lower and Stern Defense bolt carrier group
The part builders pick most often in each slot alongside these two, checked against both. Parts that conflict are left out.
Foxtrot Mike Products FM9 vs Stern Defense SD-BU45 Bolt: specs and prices
| Foxtrot Mike Products FM9 | Stern Defense SD-BU45 Bolt | |
|---|---|---|
| Best price | $275.00 at Primary Arms | $150.65 at Brownells |
| Stores | 0 of 1 in stock | 0 of 2 in stock |
| Assembly | Complete | n/a |
| Platform | AR-9 | n/a |
| Caliber | 9mm | n/a |
| Trigger Pin | .154 | n/a |
| Finish | Hardcoat Anodized | Black |
| Cartridge | n/a | .45 ACP |
Both for $425.65 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
- Foxtrot Mike Products FM9 Premium 9mm: lowest $275.00 on Jul 7, highest $275.00 on Jul 7 over the last 90 days.
- Stern Defense SD-BU45 Bolt Carrier: lowest $150.65 on Aug 30, highest $150.65 on Aug 30 over the last 90 days.
Bolt Carrier Groups frequently paired with the Foxtrot Mike Products FM9 Premium 9mm
Most picked next to it in real builds. Only parts our rules say fit the Foxtrot Mike Products FM9 Premium 9mm are listed.
Lower Receivers most paired with Stern Defense bolt carrier groups
The Stern Defense SD-BU45 Bolt Carrier is not in enough builds yet, so these are the most picked next to any Stern Defense bolt carrier group. Only parts our rules say fit the Stern Defense SD-BU45 Bolt Carrier are listed.
