CMMG DISSENT BR4 .300 Blackout 14.5″ 10+1 (2) 10rd PMAGs
$2,152.81
The CMMG DISSENT BR4 .300 Blackout 14.5″ is a compact, side-charging carbine with an adjustable gas block and pinned muzzle brake, ready for suppressed or unsuppressed use. Includes two 10-round PMAGs and a Magpul SGA stock for reliable performance out of the box.
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Description
The CMMG DISSENT BR4 .300 Blackout 14.5″ 10+1 (2) 10rd PMAGs is a compact, versatile carbine built for shooters who demand reliable performance in suppressed or unsuppressed setups. Chambered in .300 AAC Blackout, this rifle features a 14.5-inch barrel with a pinned and welded CMMG Zeroed SVD brake, bringing overall length to 16.1 inches. It includes two Magpul 10-round PMAGs and a Magpul SGA stock, delivering familiar ergonomics and handling right out of the box.
| Manufacturer | CMMG |
|---|---|
| Model | DISSENT BR4 |
| Material | 7075-T6 aluminum upper and lower receiver, steel barrel (per manufacturer specs) |
| Compatibility | .300 AAC Blackout ammunition, standard AR-15 lower parts |
| Finish | Armor Black Cerakote |
| Weight | 6.7 lbs (as configured) |
| Condition | New |
Key Features
- Adjustable Gas Block — Why it matters: lets you fine-tune cycling for different loads and suppressor use, reducing recoil and fouling.
- Reversible Side Charger — Why it matters: accommodates left- or right-handed shooters without swapping parts, keeping the action smooth under any condition.
- Pinned and Welded Muzzle Brake — Why it matters: brings barrel length to 16.1 inches, making it legal as a rifle without a stamp, while the Zeroed SVD brake cuts muzzle rise effectively.
- Magpul SGA Stock — Why it matters: provides a solid cheek weld and adjustable length of pull, matching most shooters’ natural stance.
- Two 10-Round PMAGs Included — Why it matters: gives you reliable, durable magazines right from the start, compatible with standard AR lowers.
Who It’s For
This carbine is built for the traditional shooter who values a compact platform that handles both supersonic and subsonic .300 Blackout loads without fuss. It’s ideal for home defense, patrol, or range work where reliability and adjustability matter more than flashy extras. If you appreciate a side-charging action that keeps your optics clear and your hand away from the receiver, this is your rig.
Pros / Cons
- Pros: Adjustable gas block for suppressor tuning, reversible side charger, pinned brake avoids NFA hassle, Magpul furniture out of the box.
- Cons: The 14.5-inch barrel with pinned brake limits future muzzle device swaps without gunsmith work — something to consider if you plan to change brakes often.
Comparison
| Feature | CMMG DISSENT BR4 | Geissele Super Duty | Lone Wolf Distributors GLR-300 |
|---|---|---|---|
| Caliber | .300 Blackout | .300 Blackout | .300 Blackout |
| Barrel Length | 14.5″ (16.1″ w/ brake) | 14.5″ (pinned A2) | 16″ |
| Gas System | Adjustable | Fixed | Adjustable |
| Charging Handle | Reversible side charger | Rear charging handle | Rear charging handle |
| Stock | Magpul SGA | Geissele buffer tube | Mil-spec carbine |
| Muzzle Device | CMMG Zeroed SVD brake (pinned) | Surefire Warcomp (pinned) | Standard flash hider |
| Weight | 6.7 lbs | 6.9 lbs | 7.1 lbs |
| Price | $1,922.15 | $1,850 | $1,650 |
FAQ
What is the overall length of the CMMG DISSENT BR4?
With the pinned and welded muzzle brake, the barrel reaches 16.1 inches, making the overall length approximately 33.5 inches with the stock collapsed.
Does this rifle come with a warranty?
Yes, CMMG offers a limited lifetime warranty on the receiver set and a one-year warranty on other components. Contact them directly for details.
Can I use subsonic .300 Blackout without a suppressor?
Yes, but the adjustable gas block lets you tune for subsonic loads even without a can, though performance will vary. Suppressed use is where this platform really shines.
Are the included PMAGs 10-round capacity only?
Yes, these are 10-round Magpul PMAGs, compliant with restricted-capacity states. They work with standard AR lowers and can be swapped for higher-capacity magazines where legal.
This carbine is ready to ship to all 50 states. Orders placed before 2 PM EST ship within 1–2 business days. We back every purchase with a 30-day return policy and secure checkout.
Browse more options in our AR Rifles or .300 Blackout categories.
- ✓ Nationwide delivery (all 50 states)
- ✓ Ships 1–2 business days
- ✓ 30-day returns
- ✓ Secure checkout
Last updated: April 2026
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