Does the Spike's Tactical Spider 9mm Lower work with the Stern Defense SD-BU45 Bolt Carrier?
Lower Receiver
Spike's Tactical Spider 9mm Lower
from $161.10
Bolt Carrier Group
Stern Defense SD-BU45 Bolt Carrier .45ACP
from $150.65
Spike's Tactical lower and Stern Defense bolt carrier group compatibility
Yes, they fit
The Spike's Tactical Spider 9mm Lower 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 Spike's Tactical 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 Spike's Tactical 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 Spike's Tactical Spider 9mm Lower and any bolt carrier group
- FailZero AR916%
- ODIN Works11%
Spike's Tactical Spider 9mm Lower
- Of lower picks
- 0.2%
- Median paid
- $161
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 Spike's Tactical 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.
Upper Receiver
Pistol Grip
Charging Handle
Stock & Brace
Handguard
Gas Block
Spike's Tactical Spider 9mm vs Stern Defense SD-BU45 Bolt: specs and prices
| Spike's Tactical Spider 9mm | Stern Defense SD-BU45 Bolt | |
|---|---|---|
| Best price | $161.10 at Primary Arms | $150.65 at Brownells |
| Stores | 2 of 6 in stock | 0 of 2 in stock |
| Assembly | Stripped | 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 |
| Weight | 13.9 | n/a |
Both for $311.75 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.
Spike's Tactical Spider 9mm Lower
Price history, last 90 days
- Spike's Tactical Spider 9mm Lower: lowest $161.10 on Jul 5, highest $161.10 on Jul 5 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 Spike's Tactical Spider 9mm Lower
Most picked next to it in real builds. Only parts our rules say fit the Spike's Tactical Spider 9mm Lower are listed.
Foxtrot Mike Products Premium 9mm Bolt Carrier
Fits, check noteCheck fit
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.
