DY9 ISLAND

Overview
The Derya DY9 Island is a semi-automatic, striker-fired pistol chambered in 9mm, designed for precision, control, and accessibility. Featuring the innovative Island Barrel Design, it reduces muzzle rise and enhances recoil management, making it ideal for home defense, range practice, and competitive shooting. Available in 10-round and 15-round configurations, the pistol includes a premium polymer frame with changeable backstraps, Truglo fiber optic sights, and a Melonite (Nitride) finish. The Complete Upper is compatible with frames for DY9 and frames for Glock 19 Gen 4, offering shooters a versatile upgrade option with the same performance benefits.

Technical Specifications

• Caliber: 9mm Parabellum
• Action: Striker-fired, semi-automatic
• Barrel Length: 3.86" (same as DY9)
• Barrel Material: 4140 annealed extruded steel (heat-treated, crack-inspected, drilled, and machined)
• Slide Material: Forged 4140 steel with Island Barrel Design integration
• Frame Material: Premium polymer with changeable backstraps (Small, Medium, Large, XL)
• Finish: Melonite (Nitride) in-house (Turkiye) or USA-made; optional Cerakote over Melonite for enhanced durability; polymer parts dyed throughout for consistent color
• Magazine Capacity: 10 or 15 rounds (standard); compatible with magazines for Glock 19 (15rd) and for Glock 17 (17rd) without magwell; magazines for Glock 30+ rounds compatible as they do not protrude on magwell
• Sights:
  • Front: Island Barrel Fixed Front
  • Rear: Truglo Green; M3x3mm rear sight screw (available at www.derya.us/rear-sight-screw)
  • Note: Not compatible with sights for Glock
• Optic Compatibility: RMR cut on slide (Trijicon RMR footprint, 6 x 32 thread, 2 holes); no additional optic plates included
  • How many inch per pound should the screws be at to hold the optic plate in place? We suggest  a range of 12 to 16 inch-pounds.
• Magwell: Removable; Derya magazine basepad (available at www.derya.us/magazine-base-plate-dy9) ensures compatibility with magazines for Glock 19 when magwell is installed
• Safety Features: Firing pin block, anti-drop trigger block
• Slide Thread Measurements: 4mm x .7 thread, T-8 Torx heads
• Weight: 26 oz (complete pistol)
• Length: 7.1" (same as DY9)
• Height: 5.5" with magazine (same as DY9)
• Width: 1.38" at widest point (same as DY9)
• Trigger Pull Weight: 4.5–5.5 lbs (same as DY9)
• Rail Type: Picatinny (same as DY9)

Key Features

• Island Barrel Design: Shifts mass to the barrel with four top-mounted gas ports, reducing muzzle rise for flatter recoil and faster follow-up shots.
• Fixed Front Sight: Maintains steady aim during rapid-fire sequences.
• Lighter Slide with RMR Cut: Reduces flip and bobbling, with optic-ready compatibility (RMR footprint) for enhanced versatility.
• Enhanced Recoil Management: Minimizes upward kick and ensures faster cycling for seamless target reacquisition.
• Ergonomic Grip: Polymer frame with changeable backstraps (S, M, L, XL) fits all hand sizes, ideal for women and shooters seeking comfort.
• Complete Upper Compatibility: Fits frames for DY9 and frames for Glock 19 Gen 4, perfect for upgrades.
• Use Cases: Home defense, range practice, competitive shooting.

Magazine Compatibility

• Standard Magazines: 10rd or 15rd Derya magazines included.
• Compatibility: Magazines for Glock 19 (15rd) and for Glock 17 (17rd) work without magwell; magazines for Glock 30+ rounds fit with or without magwell. Most aftermarket magazines for Glock 19 are compatible but not guaranteed (recommend reviewing YouTube DY9 Island reviews for testing).
• Magwell Note: With magwell installed, some magazines for Glock 19 may not seat fully unless equipped with Derya’s magazine basepad (available at www.derya.us/magazine-base-plate-dy9).

Availability

• Complete Pistol (https://derya.us/dy9-island/): 10rd or 15rd configurations, available at thought dealer locator at https://derya.us/dealer-locator/
• Complete Upper: Available at on our website at https://derya.us/dy9-island-barrel-complete-upper/ or through dealers, with distributors Lipsey’s, RSR Group, and Sports South.

DY9 ISLAND Overview and Tutorial Video - https://www.youtube.com/watch?v=5EY2wMzbxXA

FAQ

• What is the Derya DY9 Island?
  The DY9 Island is a striker-fired, semi-automatic 9mm pistol featuring the Island Barrel Design, which reduces muzzle rise and enhances control. Available in 10-round and 15-round configurations, it’s ideal for home defense, range practice, and competitive shooting.
• What makes the Island Barrel Design unique?
  The Island Barrel Design shifts mass to the barrel and includes four top-mounted gas ports, significantly reducing muzzle rise (by around 25%) for flatter recoil (around 12%), faster follow-up shots, and improved accuracy. The slide is specifically designed to integrate this feature, differing from the standard DY9.
• Is the DY9 Island suitable for women shooters?
  Yes, the DY9 Island’s ergonomic grip with changeable backstraps (S, M, L, XL), reduced recoil, and 26 oz weight make it ideal for women, fitting smaller hand sizes and minimizing fatigue for a comfortable, controlled shooting experience.
• Can I use the DY9 Island Complete Upper on other firearms?
  The Complete Upper is compatible with frames for DY9 and frames for Glock 19 Gen 4, allowing shooters to upgrade existing pistols with the Island Barrel’s precision and recoil management.
• What is the RMR cut, and why is it important?
  The RMR cut is a pre-milled slot on the slide for mounting optics (Trijicon RMR footprint, 6 x 32 thread, 2 holes; no additional plates included). It enhances target acquisition and versatility for various shooting scenarios.
• Where can I purchase the DY9 Island or Complete Upper?
  Both are available at www.derya.us or through Derya’s dealer network. Dealers can order through Lipsey’s, RSR Group, or Sports South.
• What are the magazine capacities for the DY9 Island Pistol?
  The pistol is available with 10-round or 15-round magazines. It’s also compatible with magazines for Glock 19 (15rd), for Glock 17 (17rd), and for Glock 30+ rounds (with or without magwell, though some magazines for Glock 19 require Derya’s basepad with magwell installed).
• How does the DY9 Island improve recoil management?
  The Island Barrel Design, combined with a lighter slide and four gas ports, minimizes upward kick and ensures faster cycling, making it easier to stay on target.
• Is the DY9 Island suitable for beginners?
  Yes, its reduced recoil, ergonomic grip with changeable backstraps, and intuitive design make it an excellent choice for beginners, fostering confidence and skill development.
• What are the primary use cases for the DY9 Island?
  The DY9 Island is designed for home defense, range practice, and competitive shooting, offering versatility for shooters of all levels.
• What are the differences between the DY9 Island and the DY9?
  • Island Barrel and Slide: The DY9 Island features a unique Island Barrel Design with four top-mounted gas ports and a specialized slide, unlike the standard DY9, for enhanced recoil management.
• What are the differences between the DY9 Island and frames for Glock 19 Gen 4?
  • Island Barrel and Slide: The DY9 Island’s Island Barrel Design and specialized slide reduce muzzle rise, unlike frames for Glock 19 Gen 4.
  • Grip Angle: Unique to the DY9 Island.
  • Sight Cuts: Proprietary, not compatible with sights for Glock. However, Derya DY9 Island Barrel is RMR optic cut ready.
  • Firing Pin and Extractor: Unique to the DY9 Island.
  • Recoil Guide: Similar to that for Glock 19 Gen 4.
  • Magwell: Includes a removable magwell as standard.
  • Holster Compatibility: Many holsters for Glock 19 are compatible, but compatibility is not guaranteed.
  • The DY9 Island Complete upper does work with a frame for Glock 19 GEN 4
• Where is the serial number located?
  The serial number is located on the bottom of the frame.
• What materials and finishes are used in the DY9 Island?
  The slide is forged 4140 steel with Island Barrel integration, and the barrel is 4140 annealed extruded steel (heat-treated, crack-inspected, drilled, machined). The frame is premium polymer, dyed for consistent color. The finish is Melonite (Nitride), with optional Cerakote over Melonite for enhanced durability.
• Can I use aftermarket magazines for Glock 19 with the DY9 Island?
  Most aftermarket magazines for Glock 19 are compatible, but not guaranteed. Without the magwell, magazines for Glock 19 (15rd) and for Glock 17 (17rd) work. With the magwell, some magazines for Glock 19 require Derya’s magazine basepad (www.derya.us/magazine-base-plate-dy9) (www.derya.us/magazine-base-plate-dy9). Magazines for Glock 30+ rounds fit regardless of magwell.
• What sights are included with the DY9 Island?
  The pistol includes a proprietary black island sight (Proprietary screw using T8 Torx) and a Truglo green rear sight (M3x3mm screw). It is not compatible with sights for Glock.
• Do you have an estimated percentage of muzzle rise and recoil reduction from the ports and island barrel? Estimate muzzle rise reduction by around 25% and recoil reduction of around 12%.
• How do I swamp by slides out to install a DY9 Island Complete Slide? Please see video https://www.youtube.com/watch?v=5EY2wMzbxXA

Below is part numbers for DY9 ISLAND BARREL COMPLETE pistol:

Below is item number for COMPLETE DY9 ISLAND UPPER: