Building a Suppressed 9mm PDW Stack: TAC 9K Ti and the Stoeger STR-9
Last updated: August 22, 2026 · Originally published: July 17, 2026
Last updated: August 22, 2026 · Originally published July 17, 2026
Turning a striker-fired 9mm pistol into a compact suppressed PDW takes four things working together: a host, a chassis, a suppressor and ammunition matched to subsonic use. This build pairs the Stoeger STR-9 Combat SX with a Heighth Defense grip module and PDW stock, then caps it with the titanium BANISH TAC 9K. Here is what each part does.
BANISH TAC 9K Ti Suppressor — $799
Spec Sheet
- Length: 4.1 inches
- Diameter: 1.3 inches
- Weight: 2.7 oz
- Material: 100% titanium (3D-printed / additive manufactured)
- Caliber Rating: 9mm (also.380, 5.7×28.300 BLK subsonic)
- Sound Reduction: 26 dB
- Mount: Direct thread (1/2×28 or 13.5×1 LH)
- Full-Auto Rated: Yes (9mm supersonic &.300 BLK subsonic)
- User-Serviceable: No
- Finish: Cerakote (black)
- Warranty: Lifetime
- Made in USA
Stoeger STR-9 Combat SX (#37005) — $699
The Stoeger STR-9 Combat SX is a full-size, suppressor-ready 9mm striker-fired pistol built on the popular Combat X chassis. It features a factory-threaded barrel, suppressor-height fiber-optic sights, optics-ready slide, ambidextrous controls, and a durable Smoked Bronze Cerakote finish. It ships with three magazines (one 17-round + two 20-round) and is designed to be an excellent host right out of the box for the BANISH TAC 9K Ti. MSRP is $699.
Spec Sheet
- Caliber: 9mm Luger
- Action: Striker-fired
- Barrel: Threaded 1/2×28 (suppressor-ready) with thread protector
- Barrel Length: ≈ 4.67 inches
- Overall Length: ≈ 7.9 inches
- Capacity: 20+1
- Magazines Included: 1× 17-round + 2× 20-round
- Frame Finish: Smoked Bronze Cerakote
- Slide Finish: Nitride-hardened Smoke Bronze Cerakote
- Sights: Raised fiber-optic front + adjustable rear (suppressor-height)
- Optics Ready: Yes (includes mounting plates + cover plate)
- Controls: Ambidextrous slide release
- Grip: Straight grip with beveled magwell + 3 interchangeable backstraps (S/M/L)
- Includes: Hard case, cable lock
- MSRP: $699
Read the full breakdown in our Stoeger STR-9 Combat SX review
Heighth Defense HGM724 Grip Module + 9″ PDW Stock — $575
The Heighth Defense HGM724 is a true drop-in PDW grip module (designed for the Springfield Echelon platform) that transforms a compatible pistol into a compact, modular PDW-style firearm. When paired with the 9-inch PDW stock, it folds small for storage/transport and extends for superior stability, control, and accuracy. It features aggressive texture, ambidextrous gas pedals, M-Lok accessory rails, and requires zero gunsmithing.
Spec Sheet
- Type: Drop-in PDW grip module + 9″ PDW stock
- Installation: True drop-in (no gunsmithing required)
- Folded Length: ≈ 11.5–12 inches
- Extended Overall Length (with stock): ≈ 21.75 inches
- Length of Pull (with stock): ≈ 16.5 inches
- Key Features: Aggressive “Straight Jacket” grip texture, ambidextrous gas pedals, A.I.M.R. mag release, monolithic M-Lok shrouds, direct optic rail, 7075 aluminum charging handle
- Suppressor Clearance: Up to ≈ 1.25″ diameter
- Construction: High-strength PA11 nylon with reinforced sections
- Origin: Made in USA
- Package Value: $575
Current Homesteading covers it in their Heighth Defense HGM724 PDW feature
Winchester Super Suppressed 9mm, 5 Boxes (250 rounds) — $154.75
Winchester Super Suppressed 9mm 147-grain is a purpose-built subsonic load engineered specifically for suppressor use. The heavy-for-caliber 147-grain FMJ bullet stays below the speed of sound, eliminating the sonic crack, while a brass encapsulation disc and clean-burning powder reduce fouling inside the suppressor. It is soft-shooting, reliable, and ideal for long range sessions, training, and quiet property/pest control use.
Spec Sheet
- Caliber: 9mm Luger
- Bullet Weight: 147 grain
- Bullet Type: Full Metal Jacket (FMJ) with brass encapsulation disc
- Velocity: Subsonic (typically ≈ 990–1,050 fps)
- Purpose: Suppressor-optimized / Target & Suppressor
- Key Benefits: Eliminates sonic crack, reduced fouling, low recoil, clean-burning
- Quantity in Package: 5 boxes
- Package Value: $154.75
- Made in USA
. Popular Outdoorsman covers it in their Winchester Super Suppressed 9mm write-up. New to subsonic? Start with our subsonic ammo explainer
Armorer Pro, 1-Year Membership — $49.99
Armorer Pro is a privacy-first mobile app (iOS & Android) for tracking firearm maintenance, round counts, ammo inventory, gear, modifications, and service history. Built by Luke McCoy (founder of USA Carry), it features zero-knowledge encryption for serial numbers, voice logging of range sessions, automatic maintenance reminders, and full arsenal organization.
Spec Sheet
- Platform: iOS and Android
- Core Functions: Round-count tracking, maintenance intervals & history, ammo inventory, gear/suppressor tracking, photo & document storage
- Privacy: Zero-knowledge encryption (serial numbers encrypted with user password), EXIF stripping on photos
- Standout Features: Voice logging, push notifications (7 days before service due), offline range access, value tracking for insurance
- Pro Tier Benefits: Unlimited firearms, custom schedules, advanced reporting, PDF export, priority support
- Membership Included: 1 full year
- Value: $49.99
Popular EDC has the walkthrough in their Armorer Pro maintenance tracker feature
Shooting Targets USA Spinner — $474.99
The Shooting Targets USA Spinner is a premium American-made interactive steel target designed for engaging, self-resetting practice. Constructed from high-quality SR500 ballistic steel, it delivers satisfying visual and auditory feedback when hit and is built for longevity with a lifetime warranty. 99 in the package, it pairs perfectly with the suppressed Stoeger STR-9 + BANISH 9K Ti setup for quiet, high-volume range sessions.
Spec Sheet
- Type: Interactive steel spinner target
- Construction: SR500 ballistic steel (or equivalent premium ballistic steel)
- Design: Self-resetting / spinning plates (typically multiple paddles)
- Origin: Made in the USA (King, North Carolina)
- Warranty: Lifetime
- Package Value: $474.99
- Ideal Use: Range practice, skill drills, suppressed shooting feedback
Guns & Gadgets Daily put it through its paces in their Shooting Targets USA Spinner review
Media Partner Guide: What to Do With Inherited Guns
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