Does the Aero Precision M4E1 Threaded Barreled work with the FailZero Fail Zero .450 Bushmaster?
Upper Receiver
Aero Precision M4E1 Threaded Barreled 5.56 Mid-Length
from $11.99
Bolt Carrier Group
FailZero Fail Zero .450 Bushmaster
from $129.74
upper and FailZero bolt carrier group compatibility
Yes, they fit
The Aero Precision M4E1 Threaded Barreled 5.56 works with the FailZero Fail Zero .450 Bushmaster. Our compatibility rules found no conflict between them.
This exact setup is in a real GunPartPicker build.
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 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 Barreled and any bolt carrier group
- This pairFailZero Fail Zero .450 Bushmaster17%
Share of builds with the FailZero Fail Zero .450 Bushmaster and any upper
- This pairAero Precision M4E1 Threaded Barreled 5.561%
Aero Precision M4E1 Threaded Barreled
- Of upper picks
- 0%
- Median paid
- $12
FailZero Fail Zero .450 Bushmaster
- Of bolt carrier group picks
- 0.9%
- Median paid
- $130
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 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.
Lower Receiver
Fits both
Trigger
Charging Handle
Aero Precision Breach Small Levers
Fits both
Stock & Brace
Pistol Grip
Barrel
Handguard
Fits both
Aero Precision M4E1 Threaded vs FailZero Fail Zero .450: specs and prices
| Aero Precision M4E1 Threaded | FailZero Fail Zero .450 | |
|---|---|---|
| Best price | $11.99 at Sportsmans Outdoor Superstore | $149.39 at BattleHawk Armory |
| Stores | 0 of 6 in stock | 5 of 7 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 | 14.5 | n/a |
| Cartridge | n/a | 6.5 Grendel |
| Style | n/a | M16 Bolt Carrier |
| Finish | n/a | Nickel Boron |
Both for $161.38 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 Barreled 5.56
Price history, last 90 days
- Aero Precision M4E1 Threaded Barreled: lowest $15.13 on Jul 11, highest $574.99 on Sep 25 over the last 90 days.
- FailZero Fail Zero .450 Bushmaster: lowest $129.74 on Jul 6, highest $189.99 on Jul 27 over the last 90 days.
Bolt Carrier Groups frequently paired with the Aero Precision M4E1 Threaded Barreled
Most picked next to it in real builds. Only parts our rules say fit the Aero Precision M4E1 Threaded Barreled are listed.
Upper Receivers frequently paired with the FailZero Fail Zero .450 Bushmaster
Most picked next to it in real builds. Only parts our rules say fit the FailZero Fail Zero .450 Bushmaster are listed.
