Strategic Sciences MFMD 5.56 0.0 OTB Suppressor -- MD+SDX

5.56 NATO ? 1/2x28 Direct Thread ? 0.0" Flush Mount ? Inconel Flow-Through ? MD+SDX System ? FDE ? NFA The MFMD-MD/SDX system is a compact, hearing-safe NFA suppressor solution that integrates a primary muzzle device with a removable Suppressor Device Extended (SDX) module. Designed for 5.56/.223 rifles threaded 1/2x28, the system delivers extreme reductions in flash, sound pressure, and recoil while maintaining reliable cycling and stable bolt velocity. Requires 0.0" over-the-barrel clearance--flush mount from barrel shoulder to first obstruction. Installation is direct-thread using the included shim set and torque tool. No adapters required. Together, the MD and SDX modules provide maximum signature suppression in the smallest footprint possible. Developed under contract with the U.S. military's Irregular Warfare Technology Support Directorate and engineered by Russ Oliver, founder of OSS Suppressors. 3D-printed monolithic Inconel construction. Flow-through internal geometry--no traditional baffles, no backpressure increase. Bolt velocity change ?2% from baseline. FDE finish. NFA rules and regulations apply.

MD+SDX System

Integrates the MD (Muzzle Device) with the removable SDX (Suppressor Device Extended) module. The SDX provides a dramatic performance increase over MD-only, delivering maximum sound suppression available in the MFMD 0.0 OTB 5.56 configuration.

Flow-Through Inconel Construction

3D-printed monolithic Inconel construction with flow-through internal geometry manages gas forward--eliminates traditional baffles and backpressure increase. The design vents combustion gases forward rather than rearward, keeping bolt velocity change to ?2% from baseline.

0.0" Flush OTB Mount

Requires 0.0" over-the-barrel clearance--flush mount from barrel shoulder to first obstruction. Measure carefully before ordering; if you don't have the clearance, it doesn't fit.

Removable SDX Module

The SDX extension is removable--run MD-only for the most compact configuration, or attach SDX for maximum sound suppression. The modular design provides configuration flexibility in a single NFA item.

FDE Finish

Flat Dark Earth (FDE) finish coordinates with FDE-configured weapon systems and accessories.

No Bolt Velocity Change

Bolt velocity change of ?2% vs. baseline across all firing schedules. The flow-through design does not alter weapon cycling characteristics--no adjustable gas block required on host weapon.

Direct Thread Installation

1/2x28 direct thread installation using included shims and torque tool. No adapters required--precise alignment achieved with included hardware.

Military Development Background

Developed under contract with the U.S. military's Irregular Warfare Technology Support Directorate. Engineered by Russ Oliver, founder of OSS Suppressors.

NFA Item

NFA-regulated item. Requires completion of NFA tax stamp process and transfer through licensed Class III FFL dealer. The Strategic Sciences MFMD 5.56 0.0 OTB MD+SDX FDE delivers maximum flow-through suppression--Inconel system with flush mount for 5.56 signature and recoil reduction. Specifications:

• Manufacturer: Strategic Sciences
• Model: MFMD-5.56-0.0-MDSDX-1/2X28-FDE
• UPC: 850083783051
• Caliber: 5.56x45 NATO / .223
• Thread Pattern: 1/2x28
• Mounting Type: Direct Thread
• OTB Requirement: 0.0" (Flush from Barrel Shoulder)
• Configuration: MD + SDX (Extended Suppressor Module)
• SDX Module: Removable
• Construction: 3D-Printed Monolithic Inconel
• Internal Geometry: Flow-Through (Baffle-Free)
• Finish: FDE (Flat Dark Earth)
• Bolt Velocity Change: ?2% from Baseline
• Backpressure: No Increase
• Installation Hardware: Shims and Torque Tool (Included)
• NFA Status: NFA-Regulated (Tax Stamp Required)
• Transfer: Class III FFL Required
• Development: U.S. Military IWTSD Contract
• Origin: USA (SDVOSB)