Home » Shop » Daniel Defense DDM4 ISR (Integrally Suppressed Rifle), Semi-automatic Rifle, 300 Blackout, 16″ Barrel
Home » Shop » Daniel Defense DDM4 ISR (Integrally Suppressed Rifle), Semi-automatic Rifle, 300 Blackout, 16″ Barrel
Sale!
$4,142.00Original price was: $4,142.00.$3,852.00Current price is: $3,852.00.
🚚 Ships to your local FFL — order online, put your dealer’s address in shipping, and we coordinate the rest. Most firearms ship same or next business day. How buying a gun online works.
Update, October 9, 2026: ATF no longer requires a Form 4, tax stamp, fingerprints or registration for suppressors, short-barreled rifles, short-barreled shotguns or AOWs. They now transfer on a standard Form 4473 with a background check. Anything below that mentions a Form 4, a wait or a tax stamp was written before this change. What changed
⚠ INTEGRALLY SUPPRESSED RIFLE — NO FORM 4 REQUIRED Since October 9, 2026, ATF no longer requires a Form 4, tax stamp, fingerprints or registration for short-barreled rifles. It transfers on a standard Form 4473 with a NICS background check. Your state’s law still applies, and taking one across state lines still needs an approved ATF Form 5320.20. Outside Texas, we ship to an SOT dealer in your state. What changed · How buying one works now
The Daniel Defense M4 ISR in Black is the standard-finish version of DD’s groundbreaking integrally suppressed 300 BLK rifle — the same cold hammer forged integrated barrel assembly, the same gas system optimized specifically for suppressed 300 BLK operation, the same complete system engineering that sets the ISR apart from any rifle-plus-suppressor combination. The Black Mil-Spec+ finish is DD’s standard cerakote-based coating — corrosion-resistant, durable, and the same finish specification used on DD’s law enforcement and military contract rifles.
The ISR registers as a suppressor under the NFA (not an SBR), because the 16-inch barrel length keeps the rifle out of the SBR category while the integrated suppressor baffles extending along the barrel length are the NFA-regulated item. At $0 NFA stamp fee under the One Big Beautiful Bill Act, the ISR represents an unprecedented entry point into a purpose-engineered integrally suppressed rifle system.
Daniel Defense M4 ISR 300 BLK — Black Specifications
Spec
Detail
Caliber
300 Blackout
Barrel
16″ cold hammer forged, integrally suppressed
Twist Rate
1:8 RH
Gas System
Direct impingement, mid-length, ISR-optimized
Handguard
Daniel Defense MFR 15.0 M-LOK
Magazine
32-round (included)
Finish
Black / Mil-Spec+
NFA Registration
Suppressor (Form 4, $0 stamp — OBBBA)
Made in USA
Black Creek, Georgia
The Engineering Case for Integrated vs. External Suppression
Adding a muzzle-mounted suppressor to an AR-15 pattern rifle is a common and effective approach. But the ISR demonstrates why purpose-built integration outperforms add-on suppression: the ISR’s baffles begin near the gas port and extend to the muzzle, giving the expanding gases significantly more time and volume to decelerate and cool before exiting the muzzle. This distributed baffle approach achieves sound reduction levels that a compact external suppressor (limited in length by handling practicality) simply cannot match. The ISR also doesn’t change the rifle’s balance — the suppressor weight is distributed over 16 inches, not concentrated at the muzzle tip. For a rifle that will be used primarily suppressed, the ISR’s integrated approach is the right engineering solution.
Ordering from Western Sport
Order online and we ship it to the licensed FFL dealer you choose near you — see how buying a gun online works. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.
FAQ — DD M4 ISR Black
ISR Black vs. ISR Brown — is there any difference beyond finish?
The Black and Brown ISR variants are mechanically identical. The Brown finish is DD’s Mil-Spec+ in their proprietary earth tone; Black is Mil-Spec+ in standard black. Choose based on aesthetic preference or how the ISR will be used alongside other equipment.
What ammunition works best in the ISR?
The ISR was optimized for 300 BLK. Subsonic loads (190–220gr) provide the quietest performance. Supersonic (110–125gr) delivers rifle-caliber terminal performance with substantially reduced muzzle blast. The ISR’s mid-length gas system runs reliably with both.
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