APEX AR9mm 16" Piston Upper with 12.7" Handguard-260202

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The FIRST and ONLY AR9mm Locking Breech Upper! Forget all the mass of blowbacks and all the gimmicky delayed devices, EQUIP yourself with the APEX 9

...REVOLUTIONIZING THE AR-9MM

Black Rifle Arms® Patented APEX 9mm 16" Piston Upper with 12.7" Handguard

The Apex 9 Is A Lightweight, Gas Operated, Magazine Fed Subgun That Fires The 9x19mm Parabellum Cartridge

The Apex 9 utilizes a short stroke gas piston operating system and fires from a rotating locking closed bolt. The Apex 9 was designed as a select fire submachine for both semi-automatic and fully automatic modes of fire, depending upon what lower receiver variant is utilized. The Apex 9 is fully compatible with any mil-spec AR-15 lower receiver, making it high adaptable for civilians, police, and military, alike.

LOWER and MAGAZINE COMPATIBILITY WITH APEX AR9MM UPPERS:

COMPATIBLE LOWER RECEIVERS:

Any Mil-Spec AR-15 Lower Receivers

COMPATIBLE MAGAZINES:

CMMG Mk4 Gen2 AR15 9mm Magazines
EXOMAG - Ejectorless Magazines

CMMG MKG Glock Mag Lower Receivers

COMPATIBLE MAGAZINES:

Glock 9mm Magazines

SPECIFICATIONS:

Action: short stroke gas piston, rotating locking bolt
Caliber: 9x19mm parabellum
Barrel: 16-inch, 1/10 twist
Muzzle Velocity: 900 to 1500 (FPS)
Effective Range: 0-150 meters
Rate of Fire: 700 to 900 rounds per minute
Weight, Complete Upper: 4 lbs. 6 oz.
Length, Complete Upper: 24 1/2"

HANDGUARD SPECS:

1-pc Free Float Design
Built-in Anti-Rotation Tabs
Scalloped Rails
7 Rows of M-Lok Slots around circumference of handguard
Continuous Top Rail
1.660" Inside Diameter (from barrel nut to forward end)

Fits Most Muzzle Devices and 1 5/8" Suppressors

Compatible with Offset Iron Sights

UPPER RECEIVER SPEC:

7075 T6 Billet Aluminum
Hard Coat Anodized

HANDGUARD SPECS:

1-pc Free Float Design
Built-in Anti-Rotation Tabs
Scalloped Rails
7 Rows of M-Lok Slots around circumference of handguard
Continuous Top Rail
1.660" Inside Diameter (from barrel nut to forward end)

Fits Most Muzzle Devices and 1 5/8" Suppressors

Compatible with Offset Iron Sights

BARREL SPECS:

Barrel Manufacturer: Black Rifle Arms
Caliber: 9mm
Length: 16"
Material: 4150 CrMoV
Profile: Medium Profile
1/10 Twist
1/2x28" Threaded Muzzle
Gas Block Journal: .750"
Nitride: Inside and Out
Barrel Extension: NiB
Barrel Extension Installed and Torqued After Nitride Finish: Yes

Rating Snapshot

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Average Customer Ratings

5.0

Mr.

Hello! I've owned one of these for a few months now, got a little over 3k though the upper, and having owned a plethora of pcc rifles from Cmmg RDBs both pre and post Fixed Ejector, a Jp5, blow back Colts, and a Di9 that I built. This is honestly, hands down the absolute best 9mm upper money can buy. Built in fixed Ejector, a gas system that doesn't carbon up the bolt tail, a nicely cut and finished barrel that is flawlessly finished with a glass smooth bore that doesn't scrap jacket material off at the port. A nice solid metal handguard, that feels beefy and well made, and a bolt and bolt carrier that have excellent machining and finish work. With a polymer dampener built into the tale that significantly reduces the harmonics that cause bolt bounce. Also the carrier is standard m16 profile so it works with any of the go fast triggers, or a Rdias, or post sample lowers. In short this really is finely the first P.C.C. upper really built by shooters that actually understand how important it is to have a product that works flawlessly and is well built with no corners cut at the finish line. My personal set up is a Cmmg Colt lower, *I did have to modify the feed ramp in the lower* but knew that going in that it's not on the approved list of magazine options Black Rifle Arms recommends. Kynshot 5007 Spring-Co Yellow BCM A5 buffer tube Elftmann Match Pro Aimpoint Pro Function has been flawless and it is amazingly soft shooting, and very non picky about ammunition. Feeding everything I have tried in it with reliable lock open on empty. Thanks for making a awesome product!

Reviewed by: Cody from Fl on 5/26/2026

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APEX AR9mm 16" Piston Upper with 12.7" Handguard

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