9mm AR15 Trigger | 9mm AR 15 Trigger

9mm AR15 Trigger | 9mm AR 15 Trigger

The 9mm AR15 is easily where the most confusion lies with the 9mm AR platform. My own research was met with a lot of “Should work” , “Most 2-Stage” and similar vague answers. One of the problems is most AR15 TRIGGER manufacturers have not tested their triggers in 9mm AR15 rifles. The other problem is there are two different kinds of 9mm AR15 BOLT CARRIERS, ramped and un-ramped. We will get into specifics below.

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9mm AR15 MAGAZINE

9mm AR15 MAGAZINE

9mm AR15 MAGAZINE – The most common 32 round 9mm AR15 magazine got it’s start long ago when 32 round 9mm UZI magazines could be had inexpensively just about anywhere that sold such items. Depending on the 9mm conversion unit used there was a choice of modified or unmodified UZI magazines. The Colt 9mm Carbine and Rock River Arms 9mm AR both use modified Uzi magazines. The Hahn 9mm conversion block also utilizes the modified UZI magazines. Olympic Arms used to offer a conversion block to utilize Sten magazines. I do not believe that is still an option from Olympic Arms. Olympic Arms also offers a 30 round 9mm AR15 magazine that is their proprietary design to common their .40 S&W, .45acp and 10mm variants. This design has nothing in common with the UZI and UZI inspired designed.

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9mm AR15 BOLT CARRIER GROUP

9mm AR15 BOLT CARRIER GROUP

JP Enhanced 9mm AR15 BOLT CARRIER GROUP is machined to the same exacting tolerances as our bolt carriers, this second generation 9mm bolt assembly is an entirely new design that eliminates the need for a central mass (slug) to readily function with our 9mm JP Silent Captured Spring without compromising bolt weight and reliability. In fact, when combined with our JPSCS-9MM, you have the heaviest, most reliable 9mm operating system that dramatically reduces bolt bounce while improving accuracy.

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Wilson Combat AR9 9mm AR15

Wilson Combat AR9 9mm AR15 carbine was designed from the ground up as the new standard in pistol caliber carbine reliability. The use of common 9mm service pistol magazines makes it an ideal choice for patrol, home defense and cost-effective tactical training. The Wilson Combat AR9 can be ordered with your choice of GlockⓇ 17, S&WⓇ M&P or BerettaⓇ 92 magazine compatibility and configured as a pistol, carbine or short barreled rifle (all NFA rules apply). The AR9 is offered with your choice of fluted or non-fluted barrels in multiple lengths and various Wilson Combat designed muzzle devices.

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Rock River Arms 9mm Lower Receiver Conversion Kit

One-stop, drop-in solution with the parts you need to convert a mil-spec small pin (.154″ dia.), .223 lower receiver with collapsible stock to accept a 9mm upper receiver assembly. Kit includes a replacement hammer, recoil spring, and buffer optimized to handle the reduced recoil force of the 9mm Luger round, as well as a Magwell Conversion Block that installs in your rifle’s magazine well to allow it to accept Rock River’s 25-round 9mm magazines, available separately. To use the Kit on a full-size rifle with fixed A1/A2-style buttstock, install the separately available Delrin® Spacer in buffer tube behind recoil spring.

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Why Would I Want a 9MM AR-15?

There are several key reasons to want to own a 9mm AR-15.

  • Duty Sidearm Compatibility – There is a great benefit to having a long gun share the same ammunition as you duty sidearm or everyday carry weapon (ECW).
  • Inexpensive 9mm Ammunition –  Typically 9MM ammunition is substantially cheaper than it’s centerfire rifle equivalent.
  • Reduced Penetration – 9MM ammunition can be a better choice than .223/5.56 centerfire where over penetration is a concern.
  • Sound Suppression – 9MM subsonic ammunition is still a formidable round when compared to a subsonic .223/5.56 centerfire cartridge. Think about it. .223/5.56 centerfire at subsonic speeds is a subsonic .22.
  • Low Recoil – 9MM in any AR format whether carbine or pistol is easier to shoot than .223/5.56 centerfire in the same gun. 9MM in any AR format is easier to shoot than the same 9mm ammunition in your Glock, Sig Sauer, Smith & Wesson M&P, Beretta or Springfield XD. Easier to shoot equates to accuracy and control. This in turn leads to more rounds on target.
  • Light Weight – In most cases a 9MM AR will be lighter than the .223/5.56 centerfire AR. The barrel will be lighter because of the larger bore required for the 9MM bullet. Some of the weight might savings might be negated by the type of 9MM AR lower used. A magazine full of 32 9mm rounds is lighter than 30 rounds of .223/5.56 centerfire. They also take up a lot less space
  • Fewer Parts – The 9mm AR-15 is blowback design. This is similar to most .22 semiautomatics, semiautomatic handguns and other 9MM cambered semiautomatic rifles. A 9MM AR15 does not use a rotating bolt and the gas system utilized by the .223/5.56 centerfire counterpart.
  • Magazine Capacity – The standard magazines are the 32 round Colts based on the UZI SMG magazines. They hold a lot of rounds in a slim package. The Glock based 9MM AR-15 magazines can be had in many capacities with 17 and 32 being typical. It should be noted that due to local laws shooters may be limited to lower capacities like 5 round and 10 round. Both Colt and Glock magazines can be purchased in those capacities. The capacity benefit diminishes though in this case.
9MM AR-15 Technical Considerations

9MM AR-15 Lower Receiver Wear and Tear

There is a misconception that firing a centerfire pistol caliber cartridge like 9MM Parabellum with the AR-15 platform is somehow “easier on the gun”. This is completely false. The AR-15 by design is meant to use the.223/5.56 cartridges ignited and expending gasses to cycle the action. This gas system combined with the locked rotating bolt do a magnificent job of absorbing the explosive energy of the .223/5.56 cartridge. The 9MM version of the AR-15 being blow-back operation does not use the gas system. This is offset by a heavy recoil buffer. There are many pictures on the internet where poor quality inconsistent 9mm ammunition caused catastrophic failure of the weapon. USE ONLY QUALITY AMMUNITION IN YOUR FIREARMS.

Colt 9mm Carbine AR6951 9mm AR 15

9MM AR15

9MM AR 15

9MM AR

AR 15 9MM

AR 9

AR9

AR15 9MM

COLT 9MM AR

9MM AR-15 History


Colt 9mm Submachine Gun R0635 aka Colt  9mm SMG

The 9mm AR15 might seem like a relatively new AR-15 variant to many newer shooters but nothing could be further from the truth. The 9mm AR15 roots date back to the early 1980’s with the Colt 9mm SMG R0635. The Colt SMG 9mm is a variation of the M-16 rifle that is blowback operated and fires from a closed bolt. It features a Safe/Semi/Full Auto Select Fire Trigger Group. The Colt 9mm SMG R0635 utilized a magwell adapter to accept UZI 9mm magazines. The UZI magazines were modified with a groove to allow the bolt to lock open after the last round.

Colt 9MM SMG R0635 Catalog Page

Colt 9MM SMG R0635

I read elsewhere that Colt never promoted the 9mm Carbines as they didn’t want the weapons to compete with their own 5.56/.223 Remington versions. This did not prevent law enforcement agencies from adopting the Colt 9MM Carbine.

9MM AR-15 Today

Today modern shooters have made the AR-15 Modern Sporting Rifle the most popular rifle in America. Shooters also tend to never be satisfied with what they have. Once exhausted of typical AR-15 hardware upgrades we tend to look to alternative AR calibers like .22 long rifle, .308 Winchester and pistol calibers. This page is devoted to the 9mm Parabellum version of the latter.

9MM AR 15 BARReL
9MM AR 15 RIFLE
9MM AR 15 FLASH HIDER OPTIONS
9MM AR-15 BOLT
9MM AR 15 BUFFER SYSTEM PARTS
9MM AR-15 DEDICATED CONVERSION BLOCK OPTIONS
9MM AR 15 TRIGGER OPTIONS
9MM AR 15 UPPER RECEIVER OPTIONS
9MM AR 15 TECHNICAL
9MM AR 15 MAGAZINE OPTIONS
9MM AR 15 LOWER RECEIVERS OPTIONS
9MM AR SIGHTS

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