DY9

Striker fire reliability with a strikingly friendly price. The Derya Arms DY9 is a semi-auto pistol chambered in 9mm. It features a 3.86" barrel, polymer frame with changeable back straps, and Truglo fiber optic front and green rear sights. It also has a firing pin block and anti-drop trigger block for safety. The DY9 is available with:

10 or 15 round magazines
Firing pin block & anti drop trigger block
Black Melotine finish
Polymer and changeable back straps
Truglo fiber optic hi-vis front and green rear sights

Compatible Magazine

Glock long magazines such as 30+ rounds will fit because the magazine will not protrude on the magwell.

When the magwell is NOT attached, the G19 - 15rds mag and G17 – 17rds mags will work. But, if the magwell is attached, the basepad restricts some G19 mags to go all the way in. MOST magazines for Glock 19 work with the pistol but is not guaranteed (I would recommend to review some of the youtube Derya DY9 reviews where they test aftermarket magazines for Glock 19).

Derya Magazine basepad for DY9 can be installed to any magazines for Glock 19 and it will work if magwell is installed. Link: https://derya.us/magazine-base-plate-dy9/

Sights

Sights installed includes:

Front: Truglo Fiber Optic (Red)
- Front Sight Screw Size: Proprietary found at https://derya.us/front-sight-screw/
Rear: Truglo Green; Optic Plate
- Rear Sight Screw Size: M3x3mm and also found at https://derya.us/rear-sight-screw/

DY9 is not compatible with Glock sights.

Magwell

Magwell is removable

Measurement of Thread (holes) on Slide

4mm x .7 thread
- Heads: T-8 Torx

Optic Plates

Installed optic plates with measurements are:

Standard footprint without the plate is a Derya footprint.
- Optic Plate Screws are proprietary - M2x5.75mm (Pitch 0.2mm , Head Angle 150°)
Marked as Truglo, Docter, Meopta, Insight, Vortex.
- Thread (4 holes) – 3mm x .5 thread
Marked as Trijicon (RMR)
- Thread (2 holes) – 6 x 32 thread

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.

Grips

Polymer with changeable back plates

Safety Type

Firing Pin Block and Anti Drop Trigger Block

Material used and Finish process

For material used, DY9 slide is forged 4140 steel. Barrel is 4140 Annealed Extruded Steel (heat treated, followed by crack inspection, then drilling, and finally machining). For frame, we use a certain formula for premium polymer frame.

For finish process, all DY9s slide and barrels are Melotine finish from Turkiye (in house) and Nitride (US Name for Melotine) for USA made (not in USA factory). If your gun is Cerakoted or Ceramic Coating, we melonite first then cerakote for ultimal performance. All polymer type parts are mainly dyed with the color (that color throughout frame).

Frequently asked questions on DY9

Differences Between Derya DY9 and Glock 19

Grip Angle
The sight cuts on the Derya DY9 are unique to this model.
Firing Pin
Extractor
The recoil guide is similar to that of the Glock 19 Gen 4.
While many Glock 19 holsters are compatible with the DY9, compatibility is not assured.
The DY9 comes with an installed magwell.

Where is serial number located? The serial number is located on the bottom of the frame. 

Can you tell me the standard factory guide rod spring weight for the Derya DY9? It is 17lbs.

What is the shelf life of a Derya DY9 pistol? A: The Derya DY9 does not have a strict "shelf life" like perishable goods; it is designed for long-term durability and can remain functional indefinitely when stored properly in a cool, dry environment with minimal humidity to prevent corrosion on metal parts. Its polymer frame resists degradation from chemicals, UV light, and environmental factors, allowing it to last 50–100+ years or more without issues. In usage tests, the DY9 has shown resilience, surviving over 20,000 rounds without failure. Avoid extreme conditions like prolonged moisture or heat for optimal storage life.

Q: What is the heat resistance of the Derya DY9's polymer frame, including its softening or deformation temperature? A: The Derya DY9's polymer frame offers solid heat resistance for practical use, maintaining its shape and rigidity up to temperatures around 150–190°F (65–88°C). It withstands heat from rapid firing without issues, as shown in shooting tests, but avoid exposing it to prolonged heat above 190°F to prevent potential warping.

Q: What is the meltdown temperature or melting point of the Derya DY9's polymer frame? A: The polymer frame of the Derya DY9, similar to other Nylon-based firearm polymers, has a melting point around 420–428°F (215–220°C), at which the material fully liquefies. However, exceeding 400°F, such as in fires, could lead to catastrophic failure.

Q: Do triggers for Glock work with Derya DY9? A: Yes, Triggers for Glock GEN 1-4 are compatible with Derya DY9.

Q: What is the stock (OEM) trigger spring weight for a Derya DY9?
A: The stock trigger spring for a Derya DY9 is rated at 5 lbs. This is the coil spring that connects to the trigger bar and assists in pulling the trigger rearward during the pull cycle.

Q: How does the trigger spring differ from the trigger pull weight?
A: The trigger spring weight refers to the resistance rating of the actual spring component (5 lbs stock), which helps return the trigger and influences the overall feel. The trigger pull weight is the total force required to fire the gun, typically around 5-5.5 lbs stock for a Derya DY9, and is affected by multiple parts including the connector, striker spring, and trigger spring.

Q: How does the trigger spring affect the trigger pull dynamics?
A: The trigger spring is an assisting spring—it pulls the trigger bar rearward, which can make the pull feel lighter if a heavier spring (e.g., 6 lbs) is used, as it provides more force to overcome friction. A lighter spring (e.g., 4.5 lbs) might improve reset feel but could reduce reliability. The stock 5 lbs balances reliability and pull weight.

Q: What are common aftermarket trigger spring options and their effects?
A:

6 lb spring: Slightly reduces perceived pull weight (by about 0.5 lbs) by adding more assisting force; popular for lighter triggers without major modifications.
5 lb or 4 lb spring: Can further lighten the pull (up to 10 oz reduction) and improve reset, but may cause reliability issues like weak reset or light strikes if not balanced with other springs.
Heavier springs (e.g., NY1 at ~8 lbs): Increases pull weight for duty use, mimicking a double-action feel; often paired with connectors for pulls around 7.5-9 lbs.

Q: Does changing the trigger spring affect reliability?
A: Yes, potentially. The stock 5 lb spring is designed for optimal reliability. Lighter springs might lead to incomplete resets or reduced primer strike force if not matched with other components. Heavier springs are reliable but increase pull weight. Always test thoroughly after changes, and avoid extremes for carry guns.

Q: What is thread size on threaded barrel for DY9?
A: 1/2x28

Q: Will an optic affect the Loaded Chamber Indicator on the Derya DY9?

A: No, the optic plate is designed to fit around the chamber indicator, allowing the optic to sit securely on top without interference.

Q: What is the expected out-of-box accuracy and point of impact for the Derya DY9?

A: The stock Derya DY9 is a service pistol designed for reliable combat accuracy rather than match-grade precision. Out of the box, its mechanical accuracy, meaning the pistol's inherent capability in a machine rest with suitable ammo, is what Derya targets during design and manufacturing.

For the barrel specifically, the base model is under 2 inches at 10 yards, around 2.5–3 inches at 15 yards, and typically 4–6 inches at 25 yards in optimal conditions from a rest, before factoring in shooter variability.

Regarding point of impact (POI), stock Deryas are typically factory-sighted for alignment at 25 yards, where the point of impact is just a hair below the top of the front sight post when using a standard sight picture (tops of front and rear sights level, front sight centered on the target). This setup often results in a slight "shoot low" tendency at closer ranges (e.g., 3 inches low at 25 yards with heavier bullets), favoring a combat hold where the front sight is placed slightly above the intended point of impact for faster target acquisition. Actual POI can vary slightly based on ammo weight, barrel specifics, and shooter technique, adjustable rear sights allow for fine-tuning if needed.

For practical shooting without a rest, group sizes will vary widely based on the shooter's skill, stance, grip, trigger control, and environmental factors, expect 4–8 inches at 25 yards as a reasonable target for an experienced shooter aiming to push the pistol's limits.

I don't see my firearm, item number, UPC, or color listed for DY9, where is it? On our website, we only list the type of firearms, as each type might include up to 10 different items. Variations exist due to different color exclusives and varying magazine capacities to comply with state gun laws. Below are all the item numbers, UPCs, and special information: If an item number starts with a number followed by an "L", it indicates a magazine limitation from the standard item. If an item number ends in "US", it means the firearm was Made in the United States. If an item number ends in "TR", it signifies the firearm was made in Türkiye.

Website Type	Item Number	Short Description	UPC Code	Magazine Used	Finish	Notes	USA MSRP
DY9	DY9.US	DY9 9mm 15rd	860012072750	1 D050682	melonite		$ 399.00
DY9	10L.DY9.US	DY9 9mm 10rd	860012072767	1 D050166	melonite		$ 399.00
DY9	DY9.TR	DY9 9mm 15rd	860012072774	1 D050682	Black melonite		$ 399.00
DY9	10L.DY9.TR	DY9 Pistol 9mm 10rd	860012072781	1 D050166	Black melonite		$ 399.00
DY9	DY9.GF.TR	DY9 9mm 15rd GREY	860012072798	1 D050682	Grey Ceramic Coating. Dyed Grey Frame.	Dunham's Exclusive	$ 399.00
DY9	DY9.ODG.US	DY9 9mm 15rd ODG	850067243007	1 D050682	ODG Dyed Frame, melonite Black Slide	Sportsman's Warehouse Exclusive	$ 399.00
DY9	DY9.MBF.TR	DY9 9mm 15rd MIDNIGHT BRONZE	850067243014	1 D050682	Midnight Bronze Ceramic Coating	Sports South Exclusive	$ 399.00
DY9	DY9.FDE.TR	DY9 9mm 15rd FDE	850067243021	1 D050682	FDE Ceramic Coating	Lipsey's Exclusive	$ 399.00
DY9	DY9.BBD.TR	DY9 9mm 15rd BURNT BRONZE	850067243052	1 D050682	Burnt Bronze Distressed Ceramic Coating over Melonite		$ 399.00
DY9 GOLD	DY9.G.US	DY9 9mm 15rd Gold	850067243038	1 D050682	melonite; Barrel: PVD Gold		$ 449.00
DY9 GOLD	10L.DY9.G.US	DY9 9mm 10rd Gold	850067243045	1 D050166	melonite; Barrel: PVD Gold		$ 449.00

DY9 Training and Tutorial Videos: