Personal Defense Weapon
MK1 MOD1.5 PDW 556
Built for the tightest spaces. Ready for the highest stakes.
The RD MK1 MOD1.5 PDW is a 6.5” short-barreled rifle chambered in 5.56 NATO or .300 Blackout—engineered for compact lethality in mission-critical environments. Whether executing VIP protection, vehicle interdiction, close-quarters battle (CQB), or Visit, Board, Search, and Seizure (VBSS) operations, the MK1 PDW delivers rapid handling, superior control, and proven reliability under pressure.
Equipped with the RD XPD Suppressor, Battle Arms Development RACK® ambidextrous charging handle, and the compact, durable B5 Systems Sierra K Stock system, the MK1 PDW is designed for fast deployment and seamless maneuverability in confined spaces.
RD’s proprietary Breathable Technology in the XPD suppressor coupled with the Patented MK1 gas system minimizes recoil and enhances heat dissipation, enabling sustained performance and faster follow-up shots in dynamic environments.
When space is limited but capability is non-negotiable, the MK1 MOD1.5 PDW 556 stands ready—purpose-built for operators who don’t get second chances.
SKU: MK1MOD1PDW556, MK1MOD1PDW300
UPC: 814034027441, 814034027458
Instruction Manual View all Products
| Barrel Length | 6.5’’ |
| Barrel Material | 4150 Chromoly |
| Barrel Finish | Melonite |
| Barrel Thread Pitch | 1/2x28 (5.56) - 5/8x24 (.300BLK) |
| Chamber | 5.56 or .300BLK |
| Twist Rate | 1:7 (5.56) - 1:8 (.300BLK) |
| Barrel Extension | M4 feed ramps |
| Gas System | Direct Impingement - pistol length |
| Gas Block Type | .750” Patented low profile gas block and threaded gas tube |
| Muzzle Device | 6” dedicated suppressed system with direct thread 3D printed RD XPD suppressor |
| Sights | Griffin Armament M2 Iron Sights |
| Upper Receiver Material | Forged 7075 T6 |
| Upper Receiver Style | Anti-rotation alignment Tab |
| Upper Receiver Finish | Type III Anodizing |
| Forward Assist | MIL-STD |
| Dust Cover | MIL-STD |
| Handguard Type | Free Float MLOK/Hybrid 1913 |
| Handguard Style | Integrated alignment tab with upper receiver |
| Handguard Length | 7” |
| Charging Handle | Battle Arms Development RACK Ambi Charging Handle |
| Lower Receiver | Forged 7075 T6 |
| Lower Receiver Finish | Type III Anodizing |
| Fire Control Group | Nickel Teflon Fire Control Group |
| Grip | B5 Grip |
| Stock | B5 Systems Sierra K |
| Height | 7.5” |
| Length | 29” extended- 25.75” collapsed |
| Weight | 6.35 LBS |
| Magazine | 5.56mm 30 Round |
| MSRP | $1,999.00 |