You’re sneaking through the dense, rain-slicked forests of Everon. It’s midnight. You’ve got a suppressed rifle, but every time you pull the trigger, the "crack" of a supersonic 5.56 round feels like a flare gun for every AI soldier within a three-kilometer radius. If you've been in this spot, you've probably gone looking for the Arma Reforger .300 BLK mods.
It's the "holy grail" for stealth players. Or at least, that's what the hype says.
Honestly, the reality is a bit messier. Most players download these weapon packs—like the Swag 300 Blackout Pack or Caps Weapon Pack—expecting a magic "delete" button for enemies. They want Hollywood-quiet kills and one-tap stopping power.
But Arma Reforger isn't Call of Duty.
The Enfusion engine handles ballistics with a level of nerdiness that can be genuinely frustrating if you don't understand the math behind the lead. Using .300 Blackout in this game requires a total shift in how you think about engagement distances.
The Subsonic Trap: Why Your Shots Feel "Weak"
The biggest misconception about the Arma Reforger .300 BLK is that it’s just a "better M4."
It’s not.
In many popular mods, such as the Swag 300 Blackout Pack (which features the Sig MCX Virtus and Rattler), you have to choose your ammo carefully. If you're running subsonic rounds (the 194gr or 220gr varieties), you are essentially throwing a heavy rock.
These rounds travel slower than the speed of sound. This means no sonic crack. It is, quite literally, "whisper quiet" compared to standard NATO rounds.
The trade-off?
Energy.
I’ve seen dozens of players complain on Discord that the .300 BLK is "bugged" because it took four chest shots to drop an FIA rebel. It’s not a bug. It’s physics. When you trade velocity for silence, you lose the hydrostatic shock that high-speed rounds provide. In the current 1.6 build of Reforger, armor penetration is a huge factor. A subsonic .300 BLK round hitting a plate carrier is basically a very expensive massage.
If you want to actually kill things reliably beyond 50 meters, you have to use supersonic loads. But then you lose the stealth advantage. It's a constant balancing act that most people get wrong.
Mod Spotlight: Which .300 BLK Pack Should You Actually Run?
Not all mods are created equal. Since Reforger relies on the community to fill the "modern" gap left by the vanilla 1980s setting, you have a few distinct choices.
1. Swag 300 Blackout Pack (by cosmic10r)
This is the current gold standard for 2026. It’s specifically focused on the Sig MCX platform. You get the Virtus and the tiny Rattler. What makes this one stand out is the custom ballistics. The mod author actually tweaked the drag coefficients. If you use the 176AP (Armor Piercing) rounds, you can actually punch through the modern vests found in the RHS mods.
2. Caps Weapon Pack
This is a massive "everything but the kitchen sink" mod. It includes the Noveske Navy in .300 BLK. It’s great for variety, but sometimes the ballistics feel a little less "tuned" than the dedicated Swag pack.
3. The Honey Badger (SWAG Weapons Pack)
The AAC Honey Badger is the poster child for this caliber. In Reforger, it’s a beast for CQB (Close Quarters Battle). If you’re clearing buildings in a town like Gravette, the short barrel and integrated suppression are unbeatable.
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Practical Ballistics: How to Not Miss Everything
Engagement range is king.
In a standard 5.56 rifle, you can usually point and click up to 200 meters without thinking about "holdovers."
With Arma Reforger .300 BLK, specifically subsonics, the bullet drop is aggressive. Think of it more like a 9mm submachine gun than a rifle. If you are zeroed at 50 meters and try to hit a target at 150 meters, your bullet is going to be digging a hole in the dirt before it ever reaches the enemy's boots.
Pro Tip: Use the 1.6 update's improved optics system. If your mod supports it, use a 1x/6x optic. Zero for 100 meters, and never try to snip with subsonics. You’re just wasting ammo.
The wind matters too. Heavy, slow bullets get pushed around. If you're playing on a server with "Real Weather" enabled, a stiff breeze will move a .300 BLK projectile significantly more than a 7.62x51 DMR round.
Why Stealth is Still "Kinda" Broken in AI Combat
Here is the bitter pill: the AI in Reforger is... let's say, "observant."
Even if you are using a suppressed .300 BLK MCX Rattler with subsonic ammo, the AI often reacts to the sound of the bullet hitting their buddy or the ground next to them.
Because Bohemia Interactive is still refining the stealth mechanics in the 1.2 and 1.6 updates, you can't just stand in a field and pick off a whole squad. Once one guy goes down, the rest will usually snap to your general direction.
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The .300 BLK doesn't make you invisible. It just buys you an extra two seconds to relocate before the RPGs start flying your way.
Actionable Steps for Your Next Loadout
If you’re heading into a modded Conflict server tonight, do this:
- Check the Ammo Name: If it says "Subsonic," do not engage anyone past 75 meters. You will miss, or you won't do enough damage to stop them before they return fire.
- Mix Your Mags: I usually carry two mags of Supersonic (for the trip to the objective) and four mags of Subsonic (for the actual infiltration).
- The "Two-Tap" Rule: Don't trust the stopping power. In Reforger's current damage model, aim for the high chest or "the T-box" (the face).
- Pair with Night Vision: .300 BLK is a night fighter's round. Without the muzzle flash of a 5.56, you are significantly harder to spot under NODs.
The Arma Reforger .300 BLK is a specialist tool. It’s not for the guy who wants to sit on a hill and "laser beam" people at 500 meters. It’s for the player who likes to get uncomfortably close, move quietly, and finish the mission before the enemy even knows there was a fight. Just remember to check your zero, or you'll be the one getting sent back to the respawn screen.
Download the Swag Pack, grab an MCX, and go find out why "Hollywood quiet" is actually a lot of work to pull off.