Stern Defense AR-15 9MM Conversion Adapter

Picture of a Stern Defense AR-15 9MM Conversion Adapter

Stern Defense AR-15 9MM Conversion Adapter

There’s no need to go with a pistol-caliber specific AR lower on your next pistol-caliber carbine build. With the Stern Defense AR-15 9mm Conversion Adapter you have the ability to utilize popular pistol magazines which you may already have a supply of.

Stern Defense make two differ models of their Conversion Adapter, one which uses Glock® magazines, and one which uses either Smith & Wesson M&P or Sig 320/250 magazines.

The Stern Defense AR-15 9mm Conversion Adapter is easily installed into any mil-spec AR-15 lower receiver within seconds and even incorporates a last-round bolt hold open feature. Each adapter is machined from aluminum and requires the use of a 9mm/.40 S&W barrel and a Glock-cut bolt.

  • Made of aircraft grade aluminum
  • Lightweight, ergonomic design
  • Installs in seconds

Notes:

  • The MAG-AD9 will not function properly on mag wells with irregular contours, “3D skulls, waves, and other non mil-spec contours.” 
  • NOT recommended for non mil spec billet lowers. 
  • For the best experience, please use the MAG-AD9 with ar-15 and m16 mil-spec lower receivers.
  • The MAG-AD9 is designed to be used with ar-15 and m16 mil-spec upper receivers.
  • The MAG-AD9 system is not compatible with New Frontier, PSA Hybrid or Foxtrot Mike bolts. This is due to the lug which strips a round off of the magazine being .035 of an inch further from center-line as compared to other bolt systems. If you are looking to use these bolts with our system Stern Defense will provide bolt modification services with the purchase of a mag-ad9. More info HERE.
  • The MAG-AD9 system is not compatible with Olympic Arms Bolts, Barrels  and Uppers

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Stern Defense SD Mod 4 9mm AR-15 Upper Receiver

Picture of a Stern Defense SD Mod 4 9mm AR-15 Upper Receiver

Stern Defense SD Mod 4 9mm AR-15 Upper Receiver

I noticed the SD Mod 4 9mm AR-15 Upper Receiver on Brownells new product section so I spent a bit of time researching Stern Defense. I didn’t learn much. The only thing I was able to determine besides their contact information is that they are a pistol caliber AR-15 hardware manufacturer, and as regular visitors know we are big proponents of the platform. If anyone has feedback on the hardware or company please drop us a line!

The Stern Defense SD Mod 4 9mm Upper Receiver is a complete, ready to go, upper receiver solution for those looking to spend less time building and more time shooting.

The 4 inch, 1-10 twist, Melonite finish barrel, is free float in a 4in M-LOK handguard attached to a 7075-T6 forged aluminum receiver.
On the end of the barrel mounted on the ½-36 threads is a 1.75” long, 1.2” diameter blast can designed to direct the short barreled blast away from the shooter.

  • 4in barrel
  • 4in M-LOK Free Float handguard
  • Complete assembly with 9mm bolt and charging handle
  • ½-36 muzzle thread pitch
  • 1.75” long by 1.2” diameter blast can muzzle device
  • SD BU9 9mm Bolt
  • Cartridge: 9mm Nato

Included in the upper receiver is charging handle and the Stern Defense 9mm Bolt which is compatible with both Glock and Colt SMG magazines, has a Melonite finish, and is works in conjunction with the Law Tactical Folding Adapter. The Stern Defense SD Mod 4 9mm Upper Receiver is made in the U.S.A

Stern Defense 4 inch MLOK rail(Barrel nut, bolts etc.)
Stern Defense 4 inch 9mm barrel.
SD MBC 9MM Blast Can.
Stern Defense assembled upper receiver with dust cover and forward assist.
Stern Defense SD BU9 Glock cut bolt.
SD CH1 enhanced charging handle.

Handguard

The free float MLOK handguard from Stern Defense offers excellent ergonomics while remaining lightweight and strong. This handguard is MLOK compatible to accept your favorite attachments. Features a secure clamp on mounting system that ensures that the handguard remains in place even under heavy abuse, sustained full auto fire, and shooting prone from a bipod. Machined from 6061 aircraft grade aluminum and hard-coat anodized for longevity and durability. These handguards also feature quick disconnect swivel holes.  Also Included,  Barrel Nut and Bolts.

  • 6061 aircraft grade aluminum.
  • Hard-coat anodized.
  • Sturdy construction.
  • Lightweight construction.
  • Length 4 inches.
  • Smallest inside diameter 1.435 inches.
  • Made in U.S.A.

9mm Barrel

Stern 9mm barrels are ideal for gun lovers who want to build their own custom dedicated 9mm AR15 upper group. Our barrels offer an advantage over the competition. Every stern defense barrel throat is machined deeper for a longer free bore to accommodate bullets with a longer ogive. We have found that some common defense rounds jam into the rifling before the round is fully chambered. Some of the barrels on the market do not accommodate this and will potentially result in nasty malfunctions, resulting in a round being stuck in the chamber requiring manual methods to clear the malfunction.

Note: Barrel comes with locating pin installed.

  • Barrel length is measured in overall length from breech to muzzle.
  • Caliber: 9mm.
  • Length: 4 Inches.
  • Made in the U.S.A.
  • Threaded .5-36.
  • 1:10 TWIST.
  • 4150 Chrome-moly steel.
  • Melonite coating.

9mm Receiver

Mil-Spec flat top upper receiver with Stern Defense laser engraved dust cover and forward assist. Machined from 7075-t6 aluminum and hard-coat anodized. Mil-spec dry film lube in the bore.

  • 7075-t6 aluminum
  •  Hard-coat anodized.
  •  Sturdy construction.
  •  Made in U.S.A.

9mm Charging Handle


Mil-spec charge handle for AR-15 rifles.  Laser engraved with Stern Defense logo.  Our latch is  Ergonomically designed and provides a positive grip and easy one hand manipulations while charging your weapon under stressful situations. Made from 6061 aircraft grade aluminum billet and hardcoat anodized.

  • Laser engraved.
  • 6061 aircraft grade aluminum billet
  • Hard coat anodized.
  • Sturdy Construction.
  • Made in U.S.A.

9mm Specific Bolt

Made with 8620 AISI steel and boasting a Mag-Phosphate finish, the Stern bolt fits into Mil-Spec and Glock-pattern upper receivers.  It functions with Colt SMG, Glock magazines and it’s fully compatible with standard AR15/M16 charging handles. Comes fully assembled with all sub-components installed, including firing pin/spring/retaining pin, extractor, and extractor spring.   Also included in bolt assembly is a proprietary center and roll pins.  Our 9mm bolts incorporate our new bolt design which caters to single stage triggers with short resets.  It also allows use with the JP silent captured spring. This bolt is compatible with the Law Tactical folding stock and the Echo trigger.

  •     Made in U.S.A.
  •     Constructed from 8620 AISI steel.
  •     Custom 4140 billet extractor providing superior ejection.
  •     Glock cut.
  •     Coating: Mag-Phosphate
  •     Weight: 15.5 OZ with weight 13.3 OZ without..
  •     9mm
  •     Compatible with single stage short reset triggers.
  •     Compatible with the Law Folding Tactical Stock
  •     Compatible with the Echo trigger.
  •     Compatible with the JP Silent capture spring

9mm Blast Can

Designed to direct muzzle blast away from shooters. Which is especially helpful on short barreled rifles and pistols. Machined from 6061 aircraft grade aluminum billet and hardcoat anodized, 1.75 inches long and 1.2 inches in diameter.

Note:  Comes with crush washer.

  • 6061 aircraft grade aluminum.
  • Hard-coat anodized.
  • Sturdy construction.
  • Lightweight construction.
  • Made in U.S.A.
  • 9mm
  • Threaded .5-36

Visit Stern Defense

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PSA GEN4 AR9 16″ 9MM NITRIDE 1-10 13 5 LIGHTWEIGHT M-LOK RAILED UPPER

Picture of a PSA GEN4 16" 9MM NITRIDE 1/10 13.5" LIGHTWEIGHT M-LOK RAILED UPPER WITH BOLT CARRIER GROUP & CHARGING HANDLE - 5165449632

PSA GEN4 16" 9MM NITRIDE 1/10 13.5" LIGHTWEIGHT M-LOK RAILED UPPER WITH BOLT CARRIER GROUP & CHARGING HANDLE - 5165449632

The Palmetto State Armory Best Selling 9MM AR15 Upper Receiver Features

Barrel: 16″ chrome moly steel barrel, chambered in 9mm (9×19) with a 1/10 twist rate. The A2 profile barrel is nitride treated for durability and finished off with a Palmetto State Armory 13.5″ Lightweight M-Lok free-float rail and an A2 birdcage style flash hider.  The barrel is laser engraved with “9MM 1:10 PSA PCC CHAMBER” because it has been optimized for use in Pistol Caliber Carbine competitions.

Upper: Billet 6061-T6 A3 AR slick side upper is hard coat anodized black for durability.  These slick side upper receivers are made for us right here in the USA.

Bolt Carrier Group: Gen 4 Hybrid 9mm BCG.  Nitride treated 8620 steel bolt, with an enhanced firing pin and external 5.56 style ejector. The bolt carrier group is compatible with most aftermarket fire control groups.

To be used with Palmetto State Armory 9mm lowers that use either Colt® or Glock®-style magazines.

Each upper is assembled to order, and test fired to check function.

PSA GEN4 16″ 9MM NITRIDE 1/10 13.5″ LIGHTWEIGHT M-LOK RAILED UPPER WITH BOLT CARRIER GROUP & CHARGING HANDLE SPECIFICATIONS

SKU: 5165449632, UPC: 5165449632, MFR#: 5165449632

Barrel Length: 16″
Barrel Profile: A2 Style
Barrel Steel: Chrome Moly
Barrel Finish: NItride
Chrome Lining: No
Muzzle Thread: 1/2-36
Chamber: 9mm (9x19) “9MM 1:10 PSA PCC CHAMBER”
Twist Rate: 1 in 10″
Barrel Extension: 9mm
Muzzle Device: A2 Bird Cage Flash Hider
Receiver Material: Billet 6061 T6
Receiver Type: Slick Side
Handguard Type: PSA 13.5″ Lightweight M-Lok Free Float Rail
BCG Included: Yes (Gen-4 Hybrid)
Bolt Steel: 8620, Nitride
Charging Handle Included: Yes

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BSF CARBON FIBER 9MM AR-15 BARRELS

BSF CARBON FIBER 9MM AR-15 BARREL
Picture of a BSF CARBON FIBER 9MM AR-15 BARREL

BSF CARBON FIBER 9MM AR-15 BARRELS

Lightweight Match-Quality Barrel for Your 9MM Pistol-Caliber AR-15

BSF Barrels builds their 9mm Luger AR-15 carbon fiber barrels with the same care that goes into a top-quality match barrel to ensure that you’ll achieve the best possible accuracy from your AR pistol, SBR, or carbine. All BSF barrels are turned from ordnance-grade 416R stainless steel, then given a roll-wrapped, tensioned, carbon fiber sleeve. The sleeve keeps weight down while providing excellent rigidity, plus enhanced cooling.

BSF uses this sleeve method on their 9mm Luger AR-15 barrels rather than simple carbon fiber wrapping because they believe wrapping traps heat and is prone to delamination. Further, BSF uses a special carbon fiber that expands at the same rate as 416R, and holes drilled into the jacket allow air to circulate around the barrel and vent heat quickly. Less heat distortion means far less risk of accuracy fade as your 9mm chambered AR-15’s barrel heats up.

BSF CARBON FIBER 9MM AR-15 BARREL SPECIFICATIONS

From the manufacturer: After turning down the barrel, we jacket a 416R Stainless steel match barrel in a roll-wrapped carbon fiber sleeve and load it under tension.  We use this jacketing method rather than wrapping the barrel in carbon fiber because this method of wrapping has been proven to trap heat and cause delamination.  The carbon fiber we use is specially designed to move at the same expansion rate as 416R stainless steel. We machine slots into the carbon fiber allowing air to move around the barrel and vent heat quicker without any delamination issues.  Using the Carbon Fiber this way keeps the rifling straighter the warmer the barrel gets because it’s under tension. This allows us to maintain superior stiffness and strength while keeping the barrel extremely lightweight.

  • 5.5″- 10.2 oz
  • 8.5″- 11.9 oz
  • 10.5″- 12.9 oz
  • 14.5″- 15.2 oz
  • 16″- 16.6 oz
  • 6 Groove Button Rifling
  • Thread: 1/2″ 28
  • .875 OD
  • 1:10 Twist Rate
  • Chambered in 9mm
  • PATENT PENDING

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YANKEE HILL MACHINE 9MM BOLT BUFFER YHM-925-A

Picture of a Yankee Hill Machine 9mm Bolt Buffer YHM-925-A

Yankee Hill Machine 9mm Bolt Buffer YHM-925-A

The Yankee Hill Machine 9mm Bolt Buffer YHM-925-A  designed for carbine AR-15 stocks is manufactured from high quality stainless steel and features extra weight and length for 9mm AR’s. The added length helps prevent breakage of the bolt catch. Includes a mil. spec. bumper. The buffer weight is 5.9 oz which places it between the 5.4 oz H3 and 6.08 oz VLTOR A5-H3 buffers.

Yankee Hill Machine has been in 9mm AR production longer than most and they know the platform well.

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