Does the Stern Defense SD 4in MOD4 M-LOK 4in work with the JP Enterprises EnhancedBolt BCG 9mm QPQ?
Upper Receiver
Stern Defense SD 4in MOD4 M-LOK 4in Barrel 9mm SDINBRLKK
from $419.27
Bolt Carrier Group
JP Enterprises EnhancedBolt BCG 9mm QPQ Finish Short Stroke
from $405.60
Stern Defense upper and JP Enterprises bolt carrier group compatibility
Yes, they fit
The Stern Defense SD 4in MOD4 M-LOK 4in Barrel 9mm works with the JP Enterprises EnhancedBolt BCG 9mm QPQ Finish. 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 Stern Defense upper and JP Enterprises 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 SD 4in MOD4 M-LOK 4in and any bolt carrier group
Stern Defense SD 4in MOD4 M-LOK 4in
- Of upper picks
- 0%
- Median paid
- $419
JP Enterprises EnhancedBolt BCG 9mm QPQ
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 Stern Defense upper and JP Enterprises bolt carrier group
The part builders pick most often in each slot alongside these two, checked against both. Parts that conflict are left out.
Lower Receiver
Pistol Grip
Charging Handle
Fits both
Stern Defense SD 4in MOD4 vs JP Enterprises EnhancedBolt: specs and prices
| Stern Defense SD 4in MOD4 | JP Enterprises EnhancedBolt | |
|---|---|---|
| Best price | $419.27 at Optics Planet | $405.60 at Optics Planet |
| Stores | 1 of 1 in stock | 0 of 1 in stock |
| Assembly | Complete | n/a |
| Platform | AR-9 | n/a |
| Caliber | 9mm | n/a |
| Length | 4 | n/a |
| Cartridge | n/a | 9mm |
| Finish | n/a | Nitride |
Both for $824.87 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 SD 4in MOD4 M-LOK 4in: lowest $376.96 on Jul 5, highest $419.27 on Jul 12 over the last 90 days.
- JP Enterprises EnhancedBolt BCG 9mm QPQ: lowest $405.60 on Jul 5, highest $405.60 on Jul 5 over the last 90 days.
Bolt Carrier Groups most paired with Stern Defense uppers
The Stern Defense SD 4in MOD4 M-LOK 4in is not in enough builds yet, so these are the most picked next to any Stern Defense upper. Only parts our rules say fit the Stern Defense SD 4in MOD4 M-LOK 4in are listed.
Upper Receivers most paired with JP Enterprises bolt carrier groups
The JP Enterprises EnhancedBolt BCG 9mm QPQ is not in enough builds yet, so these are the most picked next to any JP Enterprises bolt carrier group. Only parts our rules say fit the JP Enterprises EnhancedBolt BCG 9mm QPQ are listed.
