Does the Aero Precision M4E1 Threaded 6.5 Grendel work with the Aero Precision 5.56 BCG W/C158 Bolt?
Upper Receiver
Aero Precision M4E1 Threaded 6.5 Grendel Assembled W/Atlas
from $614.99
Bolt Carrier Group
Aero Precision 5.56 BCG W/C158 Bolt
from $148.99
Aero Precision upper and Aero Precision bolt carrier group compatibility
They fit, with a catch
The Aero Precision M4E1 Threaded 6.5 Grendel works with the Aero Precision 5.56 BCG W/C158 Bolt, with one thing to check: Bolt Carrier Group (5.56 NATO) has a 5.56 / .223 bolt; a 6.5 Grendel build needs a 6.5 Grendel / 6mm ARC bolt.
No one has built this exact setup yet, but Aero Precision uppers with Aero Precision 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 Aero Precision upper and Aero Precision bolt carrier group
Backed by thousands of qualified builds that have both an upper and a bolt carrier group.
Share of builds with the Aero Precision 5.56 BCG W/C158 Bolt and any upper
Aero Precision M4E1 Threaded 6.5 Grendel
Not in enough builds yet to report.
Aero Precision 5.56 BCG W/C158 Bolt
- Of bolt carrier group picks
- 8.4%
- Median paid
- $132
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 Aero Precision upper and Aero Precision 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
Aero Precision Breach Small Levers
Fits both
Lower Receiver
Unconfirmed
Gas Block
Stock & Brace
Pistol Grip
Barrel
Aero Precision M4E1 Threaded vs Aero Precision 5.56 BCG W/C158: specs and prices
| Aero Precision M4E1 Threaded | Aero Precision 5.56 BCG | |
|---|---|---|
| Best price | $614.99 at Brownells | $148.99 at KY Gun Company |
| Stores | 0 of 2 in stock | 0 of 6 in stock |
| Assembly | Complete | n/a |
| Platform | AR-15 | n/a |
| Gas System Length | Rifle | n/a |
| Caliber | 6.5 Grendel | n/a |
| Receiver Type | M4E1 | n/a |
| Length | 20 | n/a |
| Cartridge | n/a | 5.56 NATO |
| Finish | n/a | Black |
Both for $763.98 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.
Aero Precision M4E1 Threaded 6.5 Grendel
Price history, last 90 days
- Aero Precision M4E1 Threaded 6.5 Grendel: lowest $539.30 on Jul 6, highest $614.99 on Aug 29 over the last 90 days.
- Aero Precision 5.56 BCG W/C158 Bolt: lowest $131.53 on Jul 6, highest $149.99 on Jul 12 over the last 90 days.
Bolt Carrier Groups most paired with Aero Precision uppers
The Aero Precision M4E1 Threaded 6.5 Grendel is not in enough builds yet, so these are the most picked next to any Aero Precision upper. Only parts our rules say fit the Aero Precision M4E1 Threaded 6.5 Grendel are listed.
Bravo Company
Fits, check noteCheck fit
Cryptic Coatings 5.56 NATO
Fits, check noteCheck fit
Wilson Combat Bolt Carrier Assy 5.56 NATO Polished
Fits, check noteCheck fit
FAXON Chameleon 5.56 Nitride
Fits, check noteCheck fit
PSA 5.56 Full-Auto Nitride MPI
Fits, check noteCheck fit
San Tan Tactical Enhanced
Fits, check noteCheck fit
Upper Receivers frequently paired with the Aero Precision 5.56 BCG W/C158 Bolt
Most picked next to it in real builds. Only parts our rules say fit the Aero Precision 5.56 BCG W/C158 Bolt are listed.
