Strategic Sciences MFMD 5.56 1.3 OTB Suppressor -- MD Only 5.56 NATO ? 1/2x28 Direct Thread ? 1.3 OTB Reflex Clearance ? Inconel Flow-Through ? FDE ? NFA The MFMD-MD is an NFA-regulated, hearing-safe suppressor built as a standalone muzzle device for 5.56/.223 rifles using a 1/2x28 thread pattern. Engineered to deliver extreme signature and recoil reduction without the SD or SDX modules. Compact form installs directly to the barrel using the included shim set and tool--no adapters required. The system requires 1.3 of over-the-barrel clearance measured from the barrel shoulder to the first obstruction. If the clearance isn't available, the device will not seat properly. 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. Flash reduction approximately 98% vs. baseline flash hider. Sound reduction approximately 23 dB at right ear vs. baseline. Rearward recoil reduction approximately 63% vs. baseline. Bolt velocity change ?2% from baseline. FDE finish. The 1.3 OTB configuration telescopes back over the barrel for superior weight distribution and minimized overall footprint vs. forward-mounting designs. NFA rules and regulations apply. 1.3 OTB Reflex Design The 1.3 over-the-barrel design telescopes back over the barrel--superior weight distribution and minimized overall weapon footprint compared to conventional forward-mounting suppressors. Requires 1.3 clearance from barrel shoulder to first obstruction. If the clearance isn't available, the device will not seat properly. Flow-Through Inconel Construction 3D-printed monolithic Inconel construction with flow-through internal geometry manages gas forward--eliminates traditional baffles and backpressure increase. Bolt velocity change ?2% from baseline. 98% Flash Reduction Approximately 98% flash reduction vs. baseline flash hider. The reflex design and flow-through geometry dramatically reduce visible flash signature--critical for night vision operations and preserving dark adaptation. 23 dB Sound Reduction Approximately 23 dB sound reduction at right ear vs. baseline--MD-only, no SDX required. The 1.3 OTB configuration achieves significantly greater sound reduction than the 0.0 flush variant. 63% Recoil Reduction Approximately 63% rearward recoil reduction vs. baseline. The forward gas venting and reflex geometry redirect propellant energy--reduces felt recoil and muzzle rise for faster follow-up shots. 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 1.3 OTB FDE delivers reflex suppressor performance--~98% flash and ~23 dB reduction in compact Inconel construction for 5.56 platforms. Specifications: Manufacturer: Strategic Sciences Model: MFMD-5.56-1.3-MD-1/2X28-FDE UPC: 850083783174 Caliber: 5.56x45 NATO / .223 Thread Pattern: 1/2x28 Mounting Type: Direct Thread OTB Requirement: 1.3 from Barrel Shoulder Configuration: MD Only (Standalone) Construction: 3D-Printed Monolithic Inconel Internal Geometry: Flow-Through (Baffle-Free) Finish: FDE (Flat Dark Earth) Flash Reduction: ~98% vs. Baseline Flash Hider Sound Reduction: ~23 dB at Right Ear vs. Baseline Rearward Recoil Reduction: ~63% vs. Baseline 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)