The Hydra® 15 (Hydra) is the modular foundation of the Hydra Weapon System — a highly versatile, user-friendly AR-style platform built around quick caliber and component changes. This configuration ships in 7.62×39 and pairs the Hydra® Modular Lower Receiver (AK magazine well) and AR magazine with the Hydra Quick-Change Barrel Upper Receiver (QCB-D). It includes a 16″ 7.62×39 barrel fitted with a low-profile gas block under an 11.5″ transformable handguard, plus a Hydra modified bolt carrier group (7.62×39 bolt & firing pin), the Hydra D-Fender D-Ring for enhanced reliability, and B5 Systems stock and pistol grip.
Designed to grow with you, the Hydra 15 accepts optional magazine wells and caliber conversion kits — in many cases you only need to swap barrel, bolt, and magazine well to convert to other supported calibers (examples: .350 Legend, .300 Blackout, .450 Bushmaster). Rugged, adaptable, and built for fast swapping, the Hydra® 15 is engineered to be the most versatile “Black Rifle” platform on the market.
Base caliber: 7.62×39
Barrel length: 16″
Gas system: low-profile gas block (rifle-length/adjustment depends on config)
Handguard: 11.5″ transformable modular handguard
Upper/Lower: Hydra Quick-Change Barrel Upper Receiver (QCB-D) + Hydra Modular Lower Receiver (AR mag well)
Bolt carrier group: Hydra modified BCG (7.62×39 bolt + firing pin)
Magazine: Standard Ak magazine (included)
Stock / Grip: B5 Systems stock & pistol grip
Reliability upgrade: Hydra D-Fender D-Ring
You must have an AR upper receiver and BCG designed to take AK pattern magazines. The receiver has a wider interior diameter than your standard receiver while the BCG has longer guide channels.
Typical parts to change barrel, bolt, magazine well (and sometimes magazine)
Some combinations only require barrel + bolt (e.g., 5.56 ↔ 300 Blackout in suppressed/unsuppressed configurations where magazine compatibility exists)
For large-format calibers (e.g., .450 Bushmaster), change to appropriate magazine well and confirm bolt face/sizing and headspace with the conversion kit
Notes: Always use factory conversion kits or verified parts and have caliber conversions and headspace checked by a qualified armorer.
“All rifles are tested with the new Magpul AK mags. Due to variances in steel and polymer Eastern bloc mags, we can’t guarantee 100% compatibility with all AK magazines”
All Rifles are test fired prior to packaging. FFL is necessary to make purchase. All Federal and State Rules apply.
California, Massachusetts and New Jersey Residents are REQUIRED to select State Compliant Options.
We ship UPS Ground. All Shipping & Handling
charges are applied at checkout and will vary
based on weight and shipping destination.
Price range: $999.00 through $1,100.00
The Hydra® 15 (Hydra) is the modular foundation of the Hydra Weapon System — a highly versatile, user-friendly AR-style platform built around quick caliber and component changes. This configuration ships in 7.62×39 and pairs the Hydra® Modular Lower Receiver (AK magazine well) and AR magazine with the Hydra Quick-Change Barrel Upper Receiver (QCB-D). It includes a 16″ 7.62×39 barrel fitted with a low-profile gas block under an 11.5″ transformable handguard, plus a Hydra modified bolt carrier group (7.62×39 bolt & firing pin), the Hydra D-Fender D-Ring for enhanced reliability, and B5 Systems stock and pistol grip.
Designed to grow with you, the Hydra 15 accepts optional magazine wells and caliber conversion kits — in many cases you only need to swap barrel, bolt, and magazine well to convert to other supported calibers (examples: .350 Legend, .300 Blackout, .450 Bushmaster). Rugged, adaptable, and built for fast swapping, the Hydra® 15 is engineered to be the most versatile “Black Rifle” platform on the market.
Base caliber: 7.62×39
Barrel length: 16″
Gas system: low-profile gas block (rifle-length/adjustment depends on config)
Handguard: 11.5″ transformable modular handguard
Upper/Lower: Hydra Quick-Change Barrel Upper Receiver (QCB-D) + Hydra Modular Lower Receiver (AR mag well)
Bolt carrier group: Hydra modified BCG (7.62×39 bolt + firing pin)
Magazine: Standard Ak magazine (included)
Stock / Grip: B5 Systems stock & pistol grip
Reliability upgrade: Hydra D-Fender D-Ring
You must have an AR upper receiver and BCG designed to take AK pattern magazines. The receiver has a wider interior diameter than your standard receiver while the BCG has longer guide channels.
Typical parts to change barrel, bolt, magazine well (and sometimes magazine)
Some combinations only require barrel + bolt (e.g., 5.56 ↔ 300 Blackout in suppressed/unsuppressed configurations where magazine compatibility exists)
For large-format calibers (e.g., .450 Bushmaster), change to appropriate magazine well and confirm bolt face/sizing and headspace with the conversion kit
Notes: Always use factory conversion kits or verified parts and have caliber conversions and headspace checked by a qualified armorer.
“All rifles are tested with the new Magpul AK mags. Due to variances in steel and polymer Eastern bloc mags, we can’t guarantee 100% compatibility with all AK magazines”
All Rifles are test fired prior to packaging. FFL is necessary to make purchase. All Federal and State Rules apply.
California, Massachusetts and New Jersey Residents are REQUIRED to select State Compliant Options.
We ship UPS Ground. All Shipping & Handling
charges are applied at checkout and will vary
based on weight and shipping destination.
| Weight | 10 lbs |
|---|---|
| Dimensions | 21 × 3 × 7 in |
| Inserts | Mlok", "Keymod", "Picatinny |
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