If you are building a Cobblestone-themed inventory or just want a MAC-10 that reads clearly on sandy maps, Indigo (internal so_indigo_and_grey) is the kind of skin people sleep on because it is Common—then regret when the float they grabbed looks chalky in-game.

Quick specs

• Weapon / finish: MAC-10 · Cobblestone collection · solid-color paint
• Rarity: Common (relatively easy entry)
• Float window: 0.06–0.80
• Design: Valve in-house, not Workshop—flat color fields; character comes from wear, not decals
• Lore hook: Purple-indigo, blue, and gray overall spray, tied to the Phoenix Warriors and the Storyteller (Part 1) line about Alex Kincaid

Release & where it drops

Shipped 1 July 2014 with Operation Breakout and the Cobblestone collection—still one of the names people mention when talking early Major souvenir ecosystems.

Besides straight collection drops, Cobblestone Souvenir Packages from Majors can surface this finish—think the long run of events from 2014 ESL One Cologne / DreamHack through 2015 Katowice, Cologne, Cluj-Napoca, 2016 MLG Columbus / Cologne, 2017 Atlanta / Kraków, and 2018 Boston. Hunting by year on C5GAME or filtering by source on the Steam Market makes set completion less guesswork.

What to look at in 3D inspect

There is no busy pattern—your entire purchase decision is color uniformity and where the metal shows through.

• Low float (~0.06): Indigo reads more saturated; FN hunters watch whether the purple-blue face is even, not blotchy.
• Mid / high float: Gray takes over; “wear-through” on edges gets obvious fast.
• Hot zones on MAC-10: Magazine, barrel, and grip eat wear—check whether scuffs line up symmetrically or look like they will keep spreading after a few eco rounds.

Desert-toned maps plus a purple-gray MAC-10 is surprisingly easy for teammates (and you) to spot when swapping sides—handy for a spammable econ secondary.

Shop verdict

Buy if: You want an affordable Cobblestone brick, a unified cool-tone eco MAC-10, or souvenir flex without chasing Covert prices.

Skip or go cheaper float if: You need a loud flex skin—this is mood, not fireworks. If you only care about color blocking, slightly higher wear can trade smoother pricing without killing the vibe.

Inspect rule: Always compare in-game 3D against listings on C5GAME or Steam Market—screenshots lie on flat purples.

Expert ramble

Common does not mean “any float is fine.” Indigo punishes lazy buys: one dull panel on the receiver and your “clean purple” loadout turns into dirty laundry. I have seen players overpay for 0.06 listings that lose saturation on the mag edge while a 0.12 looks more honest in motion. Souvenir stickers add story, not geometry—still inspect the paint. And yes, you will spam this gun on force—pick wear you will not hate by round twenty.