Suppressor QD Mounting Options Explained: Rearden Plan B vs Dead Air KeyMo vs SureFire Fast-Attach
When choosing a suppressor, most people focus on sound reduction, weight, and caliber – but one of the most important decisions is often overlooked:
How your suppressor mounts to your firearm.
The mounting system affects:
Reliability
Repeatable zero
Weight
Length
Ease of use
Cross-compatibility between rifles
In this guide, we’ll explain the three most popular suppressor quick-detach (QD) mounting systems:
Rearden Plan B
Dead Air KeyMo
SureFire Fast-Attach
And help you choose the right one for your setup.
What Is a Suppressor QD Mount?
A QD (Quick Detach) mounting system allows you to quickly attach and remove your suppressor from different firearms using compatible muzzle devices.
Compared to direct-thread mounts, QD systems offer:
✅ Faster attachment and removal
✅ Better repeatability
✅ Less chance of the suppressor backing off
✅ Easy multi-host use
The 3 Most Popular Suppressor Mounting Systems
Rearden Plan B (Lightweight, Simple, Rock Solid)
Rearden Plan B is a modern, lightweight mounting ecosystem based on the popular taper mount interface originally made famous by Q and adopted by many suppressor manufacturers.
🔧 How It Works:
Tapered interface + thread locking
The taper centers the suppressor and creates a tight, repeatable seal
Threads simply secure it in place
✅ Pros:
Extremely lightweight
Very short added length
Excellent concentricity
Great repeatability
Simple and reliable
Huge ecosystem of compatible muzzle devices
Less carbon locking than ratchet systems
❌ Cons:
Not a true “push-button” QD (you still thread it on/off)
No ratcheting or locking mechanism (relies on taper + torque)
🏆 Best For:
Lightweight builds
Precision rifles
People who want short, light, and simple
Suppressors like Otter Creek Labs Polonium K, many HUB-compatible cans
Dead Air KeyMo (Bombproof, Military-Grade, Rock-Solid Lockup)
Dead Air KeyMo is one of the most proven and widely used suppressor mounting systems in the industry.
🔧 How It Works:
Uses a tapered muzzle device
Suppressor slides on and locks with a ratcheting collar
Extremely secure lockup
✅ Pros:
Incredibly strong and durable
Zero-wobble lockup
Excellent repeatability
Very resistant to carbon lock
Huge selection of muzzle devices
Trusted for hard-use rifles
❌ Cons:
Heavier than Plan B
Adds more length to the suppressor
More moving parts
🏆 Best For:
Duty rifles
Hard-use carbines
Full-auto or high round count guns
People who want absolute security over weight
SureFire Fast-Attach (Military Proven, Ultra Repeatable)
SureFire Fast-Attach is the mounting system used on many military-issued SureFire suppressors.
🔧 How It Works:
Suppressor slides over a SureFire muzzle device
Locks in place using a rotating collar
Extremely precise and repeatable
✅ Pros:
Excellent return-to-zero
Very secure lockup
Military proven
Excellent concentricity
Durable under extreme use
❌ Cons:
Limited to SureFire ecosystem
More expensive
Heavier than Plan B
Not HUB-universal
🏆 Best For:
Clone builds
Military-style rifles
Users who value repeatability and durability over modularity
Direct Comparison
| Feature | Rearden Plan B | Dead Air KeyMo | SureFire Fast-Attach |
|---|---|---|---|
| Weight | ⭐ Lightest | ❌ Heaviest | ❌ Heavy |
| Length Added | ⭐ Shortest | ❌ Longest | ⚠️ Medium |
| Locking Method | Taper + Threads | Ratcheting Lock | Rotating Lock |
| Repeatability | ⭐ Excellent | ⭐ Excellent | ⭐ Excellent |
| Durability | ⭐ Very Good | ⭐⭐⭐ Excellent | ⭐⭐⭐ Excellent |
| Ecosystem | ⭐⭐ ⭐ Huge | ⭐⭐ Popular | ⚠️ SureFire Only |
Which Mounting System Should You Choose?
Choose Rearden Plan B if:
You want the lightest and shortest setup
You like simple, rugged systems
You’re building a lightweight or precision rifle
Choose Dead Air KeyMo if:
You want maximum durability
You run hard-use or duty rifles
You swap suppressors often
You want bombproof lockup
Choose SureFire Fast-Attach if:
You’re running SureFire suppressors
You care about repeatable POI shift
You’re building a clone or duty-style rifle
HUB Compatibility (Important)
Many modern suppressors use HUB (1.375×24) threads, which allows you to swap between:
Plan B adapters
KeyMo adapters
- SureFire Fast-Attach
Other mounting systems
This means your suppressor is not locked into one system forever.
Why This Matters More Than You Think
Your mounting system affects:
Accuracy
Reliability
Weight
Length
User experience
Multi-rifle compatibility
Choosing the right mount can matter just as much as choosing the suppressor itself.
Need Help Choosing the Right Setup?
At A-Zone Armory, we help customers match:
The right suppressor
The right mounting system
The right muzzle devices
For their exact rifles and use cases.