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Stern Defense

Stern Defense Rifle Parts
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Stern Defense Products

STERN DEFENSE

STERN DEFENSE MAG-AD FLARE MOD1 MAGWELL 9MM BLACK
AR-15 9MM MAG-AD FLARED MAGWELL

The Stern Defense MAG-AD Flare Mod1 magwell is compatible with Mil-Spec forged lower receivers and designed for use with Stern Defense MAG-AD9 or MAG-ADMP9&40 conversion adapters.
It is made from black Delrin, which is a durable material, ensuring that the magwell is sturdy and reliable for fast and smooth magazine changes.
This product is manufactured in the U.S.A., highlighting its American-made quality.

In stock

£119.90

STERN DEFENSE

STERN DEFENSE 9MM COMPLETE BOLT BLACK SEMI AUTO ONLY
AR-15 9MM BOLT FOR GLOCK AND COLT

Bolt Carrier Groups

The Stern Defense 9mm AR-15 Bolt is compatible with both Glock and Colt magazines and fits standard and Glock-pattern upper receivers.
Manufactured from 8620 AISI steel with a Melonite finish, it ensures durability and corrosion resistance.
Comes fully assembled for easy installation and is designed for semi-automatic fire only, not compatible with full-auto fire-control groups.

In stock - Is a 'Call to order' product.

£199.90

STERN DEFENSE

STERN DEFENSE AR-15 CONVERSION ADAPTER FOR S&W .45ACP MAGAZINES
AR-15 M&P 45ACP CONVERSION ADAPTER

Caliber Conversion Kits

The Stern Defense AR-15 M&P Conversion Adapter allows AR-15 owners to use .45 ACP rounds with M&P pistol magazines.
Installation is quick and easy on any mil-spec AR-15 lower, and the adapter includes a last-round bolt hold-open feature.
The adapter is precision machined from 6061-T6 aluminum with a 4140 NiB-coated feedramp, ensuring durability and reliability.

In stock

£274.90

Upgrade your SD BU9 with the 9MM Bolt Replacement Kit! 🔧 Features a custom extractor for superior performance and reliability.

STERN DEFENSE

STERN DEFENSE 9MM BOLT REPLACEMENT KIT
9MM BOLT REPLACEMENT KIT

Bolt Carrier Hardware

The kit is designed for rebuilding a well-used bolt, ideal after firing many rounds.
Includes a custom 4140 billet extractor and associated components for superior ejection performance.
It is specifically made for use with the SD BU9 bolt carrier from STERN DEFENSE, LLC.

In stock - Is a 'Call to order' product.

£54.90

STERN DEFENSE

STERN DEFENSE AR-15 9MM CONVERSION ADAPTER FOR GLOCK® MAGAZINES
AR-15 9MM CONVERSION ADAPTER

Caliber Conversion Kits

The Stern Defense AR-15 9mm Conversion Adapter allows for the use of Glock® or other popular pistol magazines in your AR-15 lower receiver.
This adapter installs in seconds into any mil-spec AR-15 lower receiver and features a last-round bolt hold open.
Machined from aircraft grade aluminum, the adapter is lightweight and requires a 9mm/.40 S&W barrel and a Glock-cut bolt for operation.

4.7

In stock

£269.90 £269.90 - £279.90

Ensure your gun runs smoothly with the MAG-AD Ejector Replacement Kit 🔧. Durable and corrosion-resistant for long-lasting performance.

STERN DEFENSE

STERN DEFENSE MAG-AD EJECTOR REPLACEMENT KIT
MAG-AD EJECTOR REPLACEMENT KIT

The MAG-AD Ejector Replacement Kit is designed as an OEM replacement for Mag-AD series ejectors.
Made from heat-treated 1050 spring steel for durability.
Features an electroless-Nickel-coating for extended service life and corrosion resistance.

In stock

£21.90

Upgrade your AR-15 with the H2S Hybrid 2-Stage Trigger! 🔥 Enjoy precision and reliability for your pistol-caliber carbine. Easy drop-in installation!

STERN DEFENSE

STERN DEFENSE H2S HYBRID TRIGGER DROP-IN 2 STAGE NICKLE BORON
AR-15 H2S HYBRID TRIGGERS DROP-IN 2-Stage

Triggers

The Stern Defense H2S Hybrid 2-Stage Trigger is designed for AR platform pistol-caliber carbines, offering a mix of mil-spec reliability and competition-level precision with a 2-pound first stage and a 4-pound second stage.
This drop-in trigger is highly durable, proven by a 250,000-round torture test, and features a duty spring to prevent bump fires and failures to reset.
It is made from A2 tool-steel with options for a nickel-boron coating, and includes a 3-pound spring for adjustable poundage, catering to users seeking a lighter trigger pull for precision shooting.

Reordered

£264.90 £179.90 - £264.90

Upgrade your build with the M16 9mm Bolt for Glock & Colt! 🔧 Fully compatible, durable, and made in the USA for optimal performance.

STERN DEFENSE

STERN DEFENSE 9MM COMPLETE BOLT MAG-PHOSPHATE
M16 9MM BOLT FOR GLOCK AND COLT

Bolt Carrier Groups

The Stern Defense 9mm Bolt is compatible with both Colt SMG and Glock magazines and works with standard AR15/M16 charging handles.
It is available with a Melonite or Nickel-Boron/Melonite finish and comes fully assembled with all necessary sub-components.
This bolt supports single stage triggers with short resets and is compatible with JP silent capture spring, Law Tactical folding stock adapter, and Echo triggers.

Not available - Is a 'Call to order' product.

£189.90 £189.90 - £244.90

STERN DEFENSE

STERN DEFENSE SD MOD 4 9MM UPPER RECEIVER 16.1IN M-LOK COMPLETE BLACK
AR-15 SD MOD 4 9MM UPPER RECEIVER M-LOK COMPLETE

Upper Receivers

The Stern Defense SD Mod 4 9mm Upper Receiver is a complete assembly, ready for use with both Glock and Colt SMG magazines, featuring a 16.1in Melonited barrel and a 15in M-LOK Free Float handguard.
It includes a 9mm bolt, charging handle, and is compatible with the Law Tactical Folding Adapter, making it a convenient option for AR-15 enthusiasts.
Constructed with a 7075-T6 forged aluminum receiver and finished in black anodize, this upper receiver is manufactured in the U.S.A. by STERN DEFENSE, LLC.

Not available - Is a 'Call to order' product.

£769.90

Upgrade your AR-15 with the SD Mod 5 9mm Upper Receiver! 🛠️ Enjoy enhanced performance with M-LOK handguards and quality craftsmanship.

STERN DEFENSE

STERN DEFENSE SD MOD 5 9MM UPPER RECEIVER 6IN M-LOK COMPLETE BLACK
AR-15 SD MOD 5 9MM UPPER RECEIVERS M-LOK COMPLETE

Upper Receivers

The Stern Defense SD Mod 5 9mm Upper Receivers feature extended handguards and come with an SD HBC 9MM Blast Can to protrude the muzzle beyond the handguard.
Includes a complete assembly with a 9mm bolt and charging handle that supports both Glock and Colt SMG magazines, with a Melonite finish on the barrels.
Made in the U.S.A, these upper receivers are designed for AR-15 style rifles and adhere to all NFA rules.

Not available - Is a 'Call to order' product.

£669.90 £669.90 - £689.90

STERN DEFENSE

STERN DEFENSE SD MOD 4 9MM UPPER RECEIVER 4IN M-LOK COMPLETE BLACK
AR-15 SD MOD 4 9MM UPPER RECEIVER 4IN M-LOK COMPLETE

Upper Receivers

The Stern Defense SD Mod 4 9mm Upper Receiver is a complete assembly with a 4-inch Melonited barrel and a 4-inch M-LOK Free Float handguard, designed for quick setup and immediate use.
It features a blast can muzzle device and a Stern Defense 9mm Bolt that is compatible with both Glock and Colt SMG magazines, enhancing versatility and shooting experience.
Made in the U.S.A, the upper receiver is constructed from 7075-T6 forged aluminum and finished with anodizing for durability, with a 1-10 twist barrel and ½-36 muzzle thread pitch.

Not available - Is a 'Call to order' product.

£619.90

Upgrade your AR-15 with the GEN 2 Bolt Carrier for Glock® & Colt .40S&W. 🔧 Fully assembled and compatible with various systems.

STERN DEFENSE

STERN DEFENSE AR-15 GEN 2 BOLT CARRIER FOR GLOCK® & COLT .40S&W
AR-15 GEN 2 BOLT CARRIER FOR GLOCK® & COLT .40S&W

Bolt Carrier Groups

The AR-15 Gen 2 Bolt Carrier is made from 8620 AISI steel with a Manganese Phosphate finish and is compatible with Mil-Spec and Glock®-pattern upper receivers.
It is designed to function with Colt SMG and Glock® magazines and is fully compatible with standard AR15/M16 charging handles.
The bolt carrier comes fully assembled with all necessary sub-components and is compatible with Law tactical folding stock and Fostech Echo Trigger.

Not available - Is a 'Call to order' product.

£204.90

STERN DEFENSE

STERN DEFENSE AR-15 SD-BU45 BOLT CARRIER .45ACP BLACK
AR-15 SD-BU45 BOLT CARRIER .45ACP BLACK

Bolt Carrier Groups

The Stern Defense AR-15 SD-BU45 Bolt Carrier is specifically engineered for .45 ACP pistol-caliber carbines, ensuring reliability and durability.
It is made from 8620 AISI steel with a 4140 billet-steel extractor, features a Glock cut, and is treated with a manganese-phosphate finish for enhanced performance.
The bolt is compatible with single-stage triggers with short resets, Law Tactical folding-stock adapters, and Echo triggers, but requires an 11-ounce or heavier buffer and an upper receiver with an enlarged ejection port.

Not available - Is a 'Call to order' product.

£219.90

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