Daniel Defense DDM4 PDW SBR
Registered short-barreled rifle version of the DDM4 PDW: same 7" .300 BLK S2W barrel and MFR XL 6.0 rail, with a Maxim Defense CQB Gen 7 stock instead of the pistol brace.
- Price
- $2,556
- Weight
- 5 lb 11.2 oz
- Calibers
- .300 AAC Blackout
- Rail
- mlok
Featured in
Key Highlights
- •Registered SBR twin of the DDM4 PDW pistol, with a Maxim Defense CQB Gen 7 stock
- •7" S2W .300 Blackout barrel on pistol-length gas keeps subsonic loads subsonic
- •5/8x24 threads behind a linear compensator make it a drop-in suppressor host
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Overview
The DDM4 PDW SBR is the registered short-barreled rifle build of Daniel Defense's .300 Blackout PDW. Mechanically it is the same gun as the braced pistol: a 7-inch cold hammer forged S2W-profile barrel in Chrome Moly Vanadium, chrome lined and HP/MPI tested at a 1:7 twist, running pistol-length direct impingement behind a 4140 low-profile gas block, under a 6-inch MFR XL M-LOK rail with an SLR M-LOK MOD2 plain-front handstop already installed.
The difference is the back end. Where the pistol wears a Maxim Defense CQB pistol brace, the SBR wears the Maxim Defense CQB Gen 7 stock over the same Maxim Defense Enhanced Buffer System, which is a real stock on a registered short-barreled rifle rather than a brace on a pistol. Collapsed, the rifle is 21 inches; extended with the muzzle device it reaches 25 1/2 inches, and it weighs 5.7 pounds.
A 7-inch .300 Blackout barrel keeps subsonic loads subsonic, which is the whole argument for this configuration; powder burn, velocity, and fouling vary with the specific load and barrel. The Daniel Defense Linear Compensator pushes blast forward, and the 5/8x24 threads underneath take a suppressor mount directly. The lower is mil-spec rather than the fully ambidextrous RIII receiver, though it carries an ambidextrous safety selector and the GRIP-N-RIP charging handle is independently ambidextrous. Because it is an NFA item, it transfers through a dealer and buyers must be 21 or older.
Key Features
- 7" cold hammer forged, chrome-lined S2W-profile .300 Blackout barrel, 1:7 twist, HP/MPI tested
- Pistol-length direct-impingement gas system with a 4140 low-profile gas block
- Maxim Defense CQB Gen 7 stock over the Maxim Defense Enhanced Buffer System
- MFR XL 6.0 M-LOK handguard with an SLR M-LOK MOD2 plain-front handstop
- Daniel Defense Linear Compensator on 5/8x24 threads, 17-4 PH stainless, salt bath nitride
- Independently ambidextrous GRIP-N-RIP charging handle
- M16-profile, chrome-lined, MP-tested bolt carrier group with a properly staked gas key
- Ships with a Magpul PMAG 30 AR 300 B GEN M3 and a Daniel Defense full-latch impact case
Capability Profile
0-10 Scale Across 8 Axes
Pros
- +A real stock instead of a brace, on a rifle already built around a 21" collapsed length
- +7" .300 Blackout barrel and 5/8x24 threads make it a purpose-built suppressor host
- +Maxim Defense Enhanced Buffer System is tuned to cycle suppressed and unsuppressed
- +Linear compensator keeps blast off the shooter when it runs bare-muzzled
Cons
- −NFA-regulated short-barreled rifle: dealer transfer, registration, and 21+ purchase
- −Mil-spec lower rather than the fully ambidextrous RIII receiver
- −Mil-spec single-stage trigger at a $2,556 price point
- −7" barrel gives up most supersonic .300 Blackout velocity
Detailed Specifications
- sku
- 02-088-22220-047-c
- caliber
- 300 BLK
- Barrel Length
- 7"
- Overall Length
- 21" - 25 1/2" with muzzle device
- weight
- 5.7 lbs
- Gas System
- Pistol length, direct impingement
- Twist Rate
- 1:7
- barrelProfile
- S2W (Daniel Defense proprietary heavy barrel)
- barrel
- Chrome Moly Vanadium steel, cold hammer forged, chrome lined, mil-spec heavy phosphate coated
- railSystem
- M-LOK (MFR XL 6.0)
- Muzzle Device
- Daniel Defense Linear Compensator, 17-4 PH stainless steel, salt bath nitride
- threadPitch
- 5/8x24
- Trigger
- Mil-spec
- lower
- Mil-spec with enhanced flared magazine well and rear receiver QD
- stock
- Maxim Defense CQB Gen 7 Stock
- buffer
- Maxim Defense Enhanced Buffer System
- magazine
- Magpul PMAG 30 AR 300 B GEN M3
- case
- Daniel Defense Full-Latch Impact Plastic Case
- nfaStatus
- Short-barreled rifle, NFA-regulated transfer
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