The M4A4 and M4A1-S are CS2's most recognizable counter-terrorist rifles, but genuinely blue finishes across both models are rare: most "cool-toned" skins share the color with gray or teal, and a pure, saturated blue almost never shows up. Out of dozens of finishes across both models, this roundup only includes the ones actually built around blue as the dominant color. Prices span the full range: from a couple of dollars for the M4A1-S | Solitude in Battle-Scarred to about a thousand and a half dollars for the M4A4 | Poseidon in Factory New. The best balance of looks and cost is the M4A1-S | Guardian, a dense cobalt-blue finish that starts around $21 for Field-Tested. Below, every blue M4A4 and M4A1-S in 2026: how it looks, where it comes from, and what it costs right now.
M4A4 | Poseidon (premium grail)
M4A4 | Poseidon is a dark teal-and-blue body carrying a hand-painted illustration: the sea god Poseidon, golden trident in hand, locked in battle with two sea monsters. There's no case for it: it belongs to The Gods and Monsters Collection, released May 26, 2015 alongside the start of Operation Bloodhound. During several operations before Shattered Web, skins from this collection could drop for pass holders through the weekly weapon-drop system. Starting with Operation Shattered Web, the collection was no longer part of operation drops.
Rarity is Classified, there's no StatTrak version. Souvenir copies made through Souvenir-O-Matic also exist in 2026 — they aren't the result of the collection's original drop, they were created later like any other weapon. Its narrow float range means only three wears exist — Factory New, Minimal Wear, and Field-Tested; Well-Worn and Battle-Scarred don't exist for Poseidon at all. Operation Bloodhound closed long ago, so supply comes only from copies already in circulation plus trade-up crafting (more on that below), and the price is the highest on this list: from $1,164 for Minimal Wear to $1,516 for Factory New.
M4A1-S | Guardian (best overall)
M4A1-S | Guardian is a dense cobalt-blue body with a gray counter-terrorist logo stenciled on the magazine; the barrel, silencer, and grip stay unpainted. It drops from the Winter Offensive Weapon Case, released December 18, 2013 — one of the earliest cases in the game's history.
Rarity is Classified, a StatTrak version exists, and all five wears are available. Price climbs smoothly: from $21 for Field-Tested to $72 for Factory New, with no sharp jumps between adjacent wears — a predictable, affordable pick for clean blue without complex patterns.
M4A1-S | Blue Phosphor (most vivid)
M4A1-S | Blue Phosphor is several layers of dense cobalt-blue anodizing, topped with translucent wavy lines that read almost like smoke. The most saturated, "electric" blue in this whole roundup. There's no case for it: it belongs to The Control Collection, released December 3, 2020 alongside Operation Broken Fang. Pass holders could get a random item from the collection through the operation's shop, spending 4 Operation Stars.
Rarity is Classified, there's no StatTrak version. Souvenir copies made through Souvenir-O-Matic also exist in 2026 — they aren't the result of the collection's original drop. Its float range is extremely narrow, so only Factory New (0–0.07) and Minimal Wear (0.07–0.08) exist; nothing worse ever shows up. Operation Broken Fang closed in May 2021, so supply comes only from copies already in circulation plus trade-up crafting. Price: from $545 for Factory New to $650 for Minimal Wear — Minimal Wear occupies a narrower float slice (just 0.07–0.08, versus 0–0.07 for Factory New), so fewer copies physically exist at that wear, which is what drives the higher price.
M4A4 | Cyber Security (distinctive pattern)
M4A4 | Cyber Security is diagonal blue and purple bands over a black body, with flashes of green and yellow here and there; blue and purple are the composition's dominant colors. It drops from the Operation Broken Fang Case, released December 3, 2020 — a regular purchasable case from the same operation, separate from The Control Collection that Blue Phosphor comes from.
Rarity is Classified, a StatTrak version exists, and all five wears are available. Price: from $18 for Battle-Scarred to $143 for Factory New — a noticeable jump right at the cleanest wear, while the first four hold together tightly.
M4A1-S | Solitude (cheapest entry)
M4A1-S | Solitude is a mountain landscape done in a hydrographic style: the stock and handguard are always solid dark blue, while the receiver, magazine, and silencer are painted per pattern and can look noticeably different — from light and dark blue to yellow-green on some rare patterns. The newest skin on this list, released August 14, 2025 as a Limited Time Item in the Armory. It could be redeemed directly for 25 Armory Credits during a limited 90-day window.
Rarity is Classified, there's no StatTrak version, and all five wears are available. That window closed long ago, and there's no direct drop source left — only copies already on the market (including Souvenir copies made later through Souvenir-O-Matic). Even so, Solitude is the most affordable skin on this list: from $1.11 for Battle-Scarred to $12.70 for Factory New. If a consistently blue look matters for the build, it's worth checking the specific listing's pattern before buying.
Getting a Blue M4A4 or M4A1-S
Two of these skins drop from regular cases: Cyber Security from the Operation Broken Fang Case, and Guardian from the Winter Offensive Weapon Case. Tracker reports say Valve pulled more than thirty old operation cases, including the Winter Offensive Weapon Case, out of the active weekly drop pool in January 2026 — only five current cases plus two Terminals rotate through drops now. That means both skins are almost always bought as finished listings today rather than gambled for: for a specific wear, that's nearly always faster and cheaper than opening cases.
Poseidon and Blue Phosphor never had a case at all — both belong to operation collections (Gods and Monsters and The Control Collection, respectively) that were only ever handed out to operation pass holders, and both operations closed long ago: Gods and Monsters through the weekly weapon-drop system across several operations before Shattered Web, and The Control Collection through the Operation Broken Fang shop for 4 Operation Stars. For Poseidon there's a predictable route: a trade-up contract using ten Restricted-rarity skins from The Gods and Monsters Collection — M4A1-S | Icarus Fell and/or G3SG1 | Chronos — guarantees a Poseidon, since it's the collection's only Classified skin. Blue Phosphor doesn't work the same way: a trade-up using ten Restricted-rarity skins from The Control Collection — FAMAS | Prime Conspiracy, Five-SeveN | Berries And Cherries, and/or UMP-45 | Crime Scene — lands on one of two Classified outcomes: M4A1-S | Blue Phosphor or USP-S | Target Acquired. If all ten inputs belong to The Control Collection, each of the two results gets roughly half the contract's total weight.
Solitude has no case either — it's a one-off skin from a closed 2025 Armory redemption window, not part of a collection with a trade-up hierarchy, so the only way to get one today is to buy a finished listing on the market.
What Determines a Blue M4A4 or M4A1-S's Price
A few factors drive the price of a blue M4A4 or M4A1-S:
Rarity. All five skins on this list are Classified, but that doesn't determine price on its own — demand, how a skin is obtained, and which wears exist all matter just as much, and the price spread within this list runs past 100x.
Design and demand. How saturated the blue is and how recognizable the illustration is can both drive demand, but there's no direct link between how much blue a skin shows and its market price: Guardian and Solitude look no less "blue" than Poseidon, yet cost a fraction as much.
Float. Float doesn't just change the look — it directly determines which wears exist at all: Poseidon has no Well-Worn or Battle-Scarred, and Blue Phosphor exists only in Factory New and Minimal Wear.
StatTrak. StatTrak only exists for Cyber Security and Guardian. Poseidon, Blue Phosphor, and Solitude have no StatTrak version — don't confuse that with Souvenir copies, which in 2026 can exist thanks to Souvenir-O-Matic.
Source and supply. The case skins (Guardian, Cyber Security) exist off already-opened cases and old stock, since their case no longer sits in the active drop pool; Poseidon and Blue Phosphor never had any source besides operation rewards and trade-up crafting; Solitude exists only through copies already in circulation from its closed limited pass.
Comparing Blue M4A4 and M4A1-S Skins
Every skin from this roundup in one table, from the premium grail down to the cheapest entry:
| Skin | Shade | Price From | Best For |
|---|---|---|---|
| Poseidon | Teal-blue with gold | $1,164 | Premium grail |
| Guardian | Cobalt blue | $21 | Best overall |
| Blue Phosphor | Electric blue | $545 | Most vivid |
| Cyber Security | Blue with purple | $18 | Distinctive pattern |
| Solitude | Blue (pattern-dependent) | $1.11 | Cheapest entry |
Prices reflect LIS-SKINS listings at the time of writing and are subject to change.
Frequently Asked Questions
Which blue M4A4 or M4A1-S skin is the best?
For most players, Guardian (from $21): dense blue with no complicated patterns and a predictable price. If budget isn't a concern, go with Poseidon (from $1,164), the priciest and most recognizable of the bunch. For the smallest entry, Solitude starts at about $1.11.
Are there cheap blue M4A4 or M4A1-S skins?
Yes. Cyber Security starts at roughly $18, Guardian at about $21, and Solitude at just $1.11 for Battle-Scarred — though with Solitude, it's worth checking the specific listing's pattern, since not every colorway reads as equally blue.
How much does float affect the price of blue M4A4 and M4A1-S skins?
It varies by skin, and for some it limits which wears exist at all: Poseidon has no Well-Worn or Battle-Scarred, and Blue Phosphor only ever comes in Factory New or Minimal Wear — dirtier copies simply don't exist.
What goes well with blue M4A4 or M4A1-S skins?
The obvious pairing is a blue-themed inventory and the best blue AWP skins. Guardian or Cyber Security, for example, pair well with blue gloves.
