Does the PSA GEN4 4" 9mm 6" Lightweight M-LOK work with the FailZero Exo Nickel Boron 9mm AR9?
Upper Receiver
PSA GEN4 4" 9mm 6" Lightweight M-LOK Railed Upper
Bolt Carrier Group
FailZero Exo Nickel Boron 9mm AR9
from $175.49
Palmetto State Armory upper and FailZero bolt carrier group compatibility
Yes, they fit
The PSA GEN4 4" 9mm 6" Lightweight M-LOK Railed works with the FailZero Exo Nickel Boron 9mm 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 Palmetto State Armory 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 FailZero Exo Nickel Boron 9mm AR9 and any upper
- This pairPSA GEN4 4" 9mm 6" Lightweight M-LOK Railed11%
PSA GEN4 4" 9mm 6" Lightweight M-LOK
- Of upper picks
- 0%
- Median paid
- n/a
FailZero Exo Nickel Boron 9mm AR9
- Of bolt carrier group picks
- 0.1%
- 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 Palmetto State Armory 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.
PSA GEN4 4" 9mm 6" Lightweight vs FailZero Exo Nickel Boron 9mm: specs and prices
| PSA GEN4 4" 9mm 6" | FailZero Exo Nickel Boron | |
|---|---|---|
| Best price | n/a | $189.42 at KY Gun Company |
| Stores | n/a | 4 of 5 in stock |
| Assembly | Complete | n/a |
| Platform | AR-9 | n/a |
| Caliber | 9mm | n/a |
| Cartridge | n/a | 9mm |
| Style | n/a | Pistol Caliber Blow Back Carrier |
| Finish | n/a | Nickel Boron |
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
- FailZero Exo Nickel Boron 9mm AR9: lowest $167.44 on Jul 5, highest $214.99 on Aug 12 over the last 90 days.
Upper Receivers frequently paired with the FailZero Exo Nickel Boron 9mm AR9
Most picked next to it in real builds. Only parts our rules say fit the FailZero Exo Nickel Boron 9mm AR9 are listed.
