How to Trade Up to MAG-7 | BI83 Spectrum
MAG-7 | BI83 Spectrum drops from Operation Riptide 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
- $6.70 10× cheapest input
- Expected value
- $3.66 mean of the outcome pool
- Margin
- -45.4% $-3.04 per contract
Buying is cheaper than rolling. A Field-Tested MAG-7 | BI83 Spectrum costs $1.84 outright, against $6.70 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 Operation Riptide 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 MAG-7 | BI83 Spectrum specifically.
PP-Bizon | Lumen
G3SG1 | Keeping Tabs
Dual Berettas | Tread
MP7 | Guerrilla
Dual Berettas | Tread
AUG | Plague
USP-S | Black Lotus
AUG | Plague
USP-S | Black Lotus
G3SG1 | Keeping Tabs
Dual Berettas | Tread
MP7 | Guerrilla12 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 Operation Riptide Case draws uniformly from every Restricted Shotgun skin in the pool, so MAG-7 | BI83 Spectrum is one of 5 equally likely results. These are the other 4.
| Outcome | Odds | Cheapest price |
|---|---|---|
| M4A4 | Spider Lily | 20% | $5.44 |
| MP9 | Mount Fuji | 20% | $5.36 |
| Five-SeveN | Boost Protocol | 20% | $3.16 |
| FAMAS | ZX Spectron | 20% | $2.50 |
| MAG-7 | BI83 Spectrumyour target | 20% | $1.84 |
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 MAG-7 | BI83 Spectrum’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 MAG-7 | BI83 Spectrum’s own float range never enters that exterior band — no combination of inputs can produce it.
What MAG-7 | BI83 Spectrum 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 |
|---|---|---|
| Field-Tested | $1.84 | −$4.86 |
| Battle-Scarred | $1.91 | −$4.79 |
| Well-Worn | $2.02 | −$4.68 |
| Minimal Wear | $2.55 | −$4.15 |
| Factory New | $7.53 | +$0.83 |
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.