How to Trade Up to P90 | Chopper
P90 | Chopper drops from Gamma Case, so any contract that can produce it needs 10 Mil-Spec skins from that same case. Here is what the contract costs, what else it can land on, and the input float you need for each exterior.
- Odds per contract
- 20% 1 in 5
- Contract cost from
- $2.80 10 × cheapest input
- Expected value
- $1.41 mean of the outcome pool
- Margin
- -49.6% $-1.39 per contract
Buying is cheaper than rolling. A Battle-Scarred P90 | Chopper costs $1.23 outright, against $2.80 for a contract with a 20% chance of producing one. Trade up for the process, not the value.
The contract
10 inputs, all Mil-Spec, all from Gamma Case. Concentrating every input in one case is what keeps your odds at 20% — mixing cases splits the probability across both pools and lowers your chance at P90 | Chopper specifically.
PP-Bizon | Harvester
P250 | Iron Clad
MAC-10 | Carnivore
P250 | Iron Clad
Nova | Exo
Nova | Exo
Nova | Exo
P250 | Iron Clad
MAC-10 | Carnivore
SG 553 | Aerial
SG 553 | Aerial
Nova | Exo12 further eligible inputs are available — open the reverse trade-up calculator to price a full contract against your own inventory.
What else this contract can land on
A contract from Gamma Case draws uniformly from every Restricted SMG skin in the pool, so P90 | Chopper is one of 5 equally likely results. These are the other 4.
| Outcome | Odds | Cheapest price |
|---|---|---|
| AWP | Phobos | 20% | $2.09 |
| R8 Revolver | Reboot | 20% | $1.27 |
| Sawed-Off | Limelight | 20% | $1.25 |
| AUG | Aristocrat | 20% | $1.23 |
| P90 | Chopperyour target | 20% | $1.23 |
Input float for each exterior
CS2 normalises float across a trade-up: each input’s float becomes a 0–1 position inside its own range, those are averaged, and the average is applied to P90 | Chopper’s range of 0.00–0.60. To land a given exterior, your ten inputs must average the normalised float below.
| Target exterior | Output float | Required avg. input float |
|---|---|---|
| Factory New | 0.0350 | 0.0583 |
| Minimal Wear | 0.1100 | 0.1833 |
| Field-Tested | 0.2650 | 0.4417 |
| Well-Worn | 0.4150 | 0.6917 |
| Battle-Scarred | 0.5250 | 0.8750 |
“Not reachable” means P90 | Chopper’s own float range never enters that exterior band — no combination of inputs can produce it.
What P90 | Chopper is worth right now
Worth comparing against the contract cost above before you commit: buying the skin outright is frequently cheaper than rolling for it.
| Exterior | Price | vs. contract cost |
|---|---|---|
| Battle-Scarred | $1.23 | −$1.57 |
| Field-Tested | $1.36 | −$1.44 |
| Well-Worn | $1.36 | −$1.44 |
| Minimal Wear | $1.52 | −$1.28 |
| Factory New | $3.23 | +$0.43 |
Build this contract
Price a full ten-slot contract against live inputs, set your own float values, and see the outcome odds update as you go.