Does the Aero Precision M4E1 Threaded Upper work with the FailZero?
Aero Precision upper and FailZero bolt carrier group compatibility
Yes, they fit
The Aero Precision M4E1 Threaded Upper works with the FailZero. Our compatibility rules found no conflict between them.
No one has built this exact setup yet, but Aero Precision uppers with FailZero 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 FailZero 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 M4E1 Threaded Upper and any bolt carrier group
Share of builds with the FailZero and any upper
Aero Precision M4E1 Threaded Upper
- Of upper picks
- 2.3%
- Median paid
- $594
FailZero
- Of bolt carrier group picks
- 0%
- Median paid
- n/a
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 FailZero 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
Fits both
Stock & Brace
Pistol Grip
Suppressor
Aero Precision M4E1 Threaded vs FailZero: specs and prices
| Aero Precision M4E1 Threaded | FailZero | |
|---|---|---|
| Best price | $593.99 at AR15 Discounts | $140.70 at BattleHawk Armory |
| Stores | 0 of 2 in stock | 5 of 5 in stock |
| Assembly | Complete | n/a |
| Platform | AR-15 | n/a |
| Gas System Length | Mid-Length | n/a |
| Caliber | 5.56 NATO | n/a |
| Receiver Type | M4E1 | n/a |
| Length | 16 | n/a |
| Cartridge | n/a | 5.56 NATO |
| Style | n/a | M16 |
| Finish | n/a | Nickel Boron |
Both for $734.69 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
- Aero Precision M4E1 Threaded Upper: lowest $593.99 on Jul 5, highest $624.99 on Jul 14 over the last 90 days.
- FailZero: lowest $140.70 on Jul 5, highest $189.99 on Aug 29 over the last 90 days.
Bolt Carrier Groups frequently paired with the Aero Precision M4E1 Threaded Upper
Most picked next to it in real builds. Only parts our rules say fit the Aero Precision M4E1 Threaded Upper are listed.
Upper Receivers most paired with FailZero bolt carrier groups
The FailZero is not in enough builds yet, so these are the most picked next to any FailZero bolt carrier group. Only parts our rules say fit the FailZero are listed.
