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Airsoft rifle SR-25K (EC-903) ADVANCED III, Kestrel ECU, 2 magazines
The SR-25 (Stoner Rifle-25) is a semi-automatic sniper rifle designed by Eugene Stoner and manufactured by Knight's Armament Company. The weapon is based on the AR-10 and was introduced to the market in the early 1990s. After several modifications, SOCOM added the SR-25 to its arsenal in 2000 as the Mk 11 MOD 0.
The Advanced III series is a continuation of the popular E&C Advanced series. It uses proven and time-tested parts and further enhances the quality and performance of these airsoft guns.
Weapons Advanced III are ready for reliable and trouble-free operation straight out of the box, with a muzzle velocity of up to 140 m/s. The new feature is the Kestrel processor unit and two mid-cap magazines included in the package.

APPEARANCE
The gun is mostly metal - the upper/lower receiver, sights, stock tube, outer barrel with barrel extension and flash hider and forearm. The weapon has an M-Lok handguard and a RIS rail on the upper side of the body for attaching accessories such as rifle scopes, red-dots, flashlights, lasers, etc. The sling is attached using a metal lock for a QD sling eye between the body and the stock tube.
The pistol grip and the retractable 5-position stock, which serves as battery storage, are made of high quality polymer. The stock has a roughened grip for a better and more secure grip, the buttstock is rubber. The receiver and forearm are black anodized for good corrosion protection and abrasion resistance.
Pulling the ambidextrous charging lever accesses the rotating ring of the hop-up chamber (ProWin style). The imitation bolt is locked, making hop-up adjustment very comfortable. The bolt catch is functional, and as with the real steel version, it is located on the right side of the body. The weapon also has an ambidextrous fire selector, as well as a magazine release. The type of weapon and the unique serial number are stamped on the trigger guard.
KESTREL ECU
The gun is equipped with a Kestrel V2 Basic programmable processor unit that protects the gearbox and battery from damage (over-discharge or over-voltage/short circuit), allows for 5 levels of pre-cocking adjustment and selector lever behavior (SEMI / Binary / FULL AUTO / 3-shot burst), also has an active brake function and supports the use of powerful brushless or super torque motors.
Settings are simply made using the selector lever and trigger.

UPGRADE PARTS
The following internal upgrade parts are installed in ADVANCED III series weapons:
- Kestrel ETU (Electronic Trigger Unit) with microswitch and low-resistance wiring
- Metal nozzle with double sealing
- Metal cylinder head with double sealing
- Polished stainless steel cylinder
- Metal piston head with bearing
- Polymer piston with hardened steel teeth
- Stainless steel QD spring guide with bearing
- Metal QD gearbox (with quick change spring)
- Reinforced 18:1 gear set
- 8 mm bearing
- Rotary Hop-Up chamber ProWin style
- Precision 6.03 mm barrel
- DeanT connector
PERFORMANCE
This Advanced Series gun is designed directly from AirsoftPro and manufactured by the E&C factory to deliver superior performance of 140 m/s (1.9 J / 0.20 g) without the need for complex tuning or upgrades.
Out of the box, the gun has a muzzle velocity of 130 m/s. But once you replace the spring (thanks to the gearbox with quick-change spring simply through the stock tube) with the M130 included in the package, you immediately get a gun with a great muzzle velocity of 140 m/s without having to upgrade the gearbox. The internal parts of the gun are designed to handle this configuration long term and without problems. The gun is superbly balanced and built - making even the M130 dpting capable of such performance. In testing the gun, we measured an average of 137 m/s.
Suitable ammunition are BBs weighing 0.30 - 0.32 g.


QUALITY AND RELIABILITY
E&C guns are generally known for their quality and reliability. The failure rate is less than 1.5% - that's several times lower than average and you get a reliable gun for your money.
Li-Po 11,1 V READY
The gun has a Dean-T connector on the low-resistance cables and is ready to use 11.1V Li-Po batteries. As usual with branded guns, neither the charger nor the battery are included. Compatible batteries, chargers, or spare magazines can be found in the Related products section below.


2 MAGAZINES IN THE PACKAGE
Included are 2 mid-cap magazines for 160 BBs. This further increases the value of the Advanced III series weapons and improves the reliability of the weapon. Spare magazines are recommended to choose the same brand, i.e. E&C, however the gun is also compatible with CYMA, TopArms, etc.
EXCLUSIVE DISTRIBUTOR
AirsoftPro.cz has been the exclusive distributor of the E&C brand for the Czech Republic since 2018. We can guarantee a trouble-free warranty service of the gun.

PACKAGE CONTENTS
- Airsoft rifle ADVANCED III
- 2x metal mid-cap magazine (130 BBs)
- M130 spring
- User manual
East Crane (HongKong) co., LTD is a professional developer tooling design company for more than twenty years experience. With the ever-growing reputation and many years of experience, East Crane decided to create its own brand "E&C". The company's motto is the highest possible quality in an efficient production process and with the support of its fans. E&C airsoft products are known for their reliability, durability and excellent price / performance ratio.
Shooting mode |
Semi and full auto |
Operation |
Electric (AEG) |
BB energy |
2,0 J |
Velocity |
140 m/s (459 FPS) |
Theoretical range |
63 m |
Appropriate BBs weight |
Length |
885 / 970 mm |
Weight |
~3220 g |
Forearm |
Metal, M-LOK |
Body |
Metal alloy |
Stock |
Plastic, retractable |
Silencer thread |
M14x1 CCW outer |
"F" mark in the pentagon |
No |
Inner barrel |
~420 mm x 6,03 mm |
Hop-up |
Plastic, adjustable |
Gearbox |
V2, Metal alloy |
Bearings |
8 mm metal |
Gears |
Metal alloy, 18:1 |
Piston |
Nylon with a full metal teeth |
Piston head |
Aluminium |
Nozzle |
Metal |
Motor |
Standard torque motor, long axle |
Electronics |
Processor unit |
Magazine capacity |
130 |
Magazine material |
Metal |
Type of the magazine |
Low capacity spring |
Included in the package? |
No |
Maximum suitable voltage |
11,1 V Li-Po |
Suitable battery |
Mini CQB (buy here) |
Connector |
T-Dean |
Battery location |
In stock |
Magazine |
Yes |
Charger |
No |
Battery |
No |
Other accessories |
2nd magazine, M130 spring, DeanT-Mini Tamiya adapter |