Does the Yankee Hill Machine .223 Rem/5.56 Flat work with the FailZero AR9?
Upper Receiver
Yankee Hill Machine .223 Rem/5.56 Flat Top Stripped
from $7.99
Bolt Carrier Group
FailZero AR9
from $132.03
Yankee Hill Machine upper and FailZero bolt carrier group compatibility
Yes, they fit
The Yankee Hill Machine .223 Rem/5.56 Flat Top works with the FailZero AR9. 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 Yankee Hill Machine 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 Yankee Hill Machine .223 Rem/5.56 Flat and any bolt carrier group
- This pairFailZero AR94%
Share of builds with the FailZero AR9 and any upper
- This pairYankee Hill Machine .223 Rem/5.56 Flat Top4%
Yankee Hill Machine .223 Rem/5.56 Flat
- Of upper picks
- 0.3%
- Median paid
- $8
FailZero AR9
- Of bolt carrier group picks
- 0.3%
- Median paid
- $131
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 Yankee Hill Machine 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
Fits both
Lower Receiver
Fits, check note
Muzzle Device
Pistol Grip
Stock & Brace
Handguard
TacFire Maximize Your 's Potential
Fits both
Yankee Hill Machine .223 vs FailZero AR9: specs and prices
| Yankee Hill Machine .223 | FailZero AR9 | |
|---|---|---|
| Best price | $96.29 at Guns.com | $132.03 at BattleHawk Armory |
| Stores | 4 of 6 in stock | 4 of 4 in stock |
| Assembly | Stripped | n/a |
| Platform | AR-15 | n/a |
| Caliber | 5.56 NATO | n/a |
| Receiver Type | A3 | n/a |
| Cartridge | n/a | 9mm |
| Style | n/a | Pistol Caliber Blow Back Carrier |
| Finish | n/a | Nitride |
Both for $228.32 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
- Yankee Hill Machine .223 Rem/5.56 Flat: lowest $96.29 on Jul 5, highest $108.99 on Aug 2 over the last 90 days.
- FailZero AR9: lowest $132.03 on Jul 5, highest $179.99 on Aug 28 over the last 90 days.
Bolt Carrier Groups frequently paired with the Yankee Hill Machine .223 Rem/5.56 Flat
Most picked next to it in real builds. Only parts our rules say fit the Yankee Hill Machine .223 Rem/5.56 Flat are listed.
Upper Receivers frequently paired with the FailZero AR9
Most picked next to it in real builds. Only parts our rules say fit the FailZero AR9 are listed.
