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.


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


Angstadt Arms Jack 9 9mm AR-15 Receiver Set

Picture of an Angstadt Arms Jack 9 9mm AR-15 Receiver Set

Angstadt Arms Jack 9 9mm AR-15 Receiver Set

Certain to appeal to shooters who tend to like things geared towards the dark side is the Jack 9 by Angstadt Arms.  Angstadt Arms Jack 9 9mm AR-15 Receiver Set is a dedicated GLOCK® magazine fed 9mm AR-15 matched lower and upper receiver set that features Sharps Brothers iconic skull design. The Jack 9 Includes last round bolt hold open. The Jack 9 milled from billet aluminum, as opposed to using forged aluminum, allows a level of detail that can be difficult to achieve in standard firearms design. When you use Angstadt Arms products, you see why they hold their craftsmanship to such high standards. Each element is crisply defined, and everything you see and feel has taken an immense amount of consideration — down to the precise size, shape, and placement of every curve and intersection.

  • Iconic skull design lower receiver by Sharps Bros. Manufactured exclusively for Angstadt Arms
  • Last round bolt hold open on an empty magazine
  • Lower receiver accepts 9mm, .40 S&W and .357 SIG GLOCK® magazines
  • Integrated, oversized trigger guard
  • Machined from 7075-T6 billet aluminum with a matte black hard-coat anodized finish
  • Slick side upper receiver with appropriately sized ejection port and no forward assist or dust cover
  • Threaded bolt catch screw
  • For use with a 9mm bolt carrier assembly and a standard AR-15 hammer
  • Patent(s) pending
  • Accepts aftermarket Glock® 9mm double stack magazines. We recommend using factory Glock® magazines


ORION 9mm AR-15 | 9mm AR Lower | 9mm AR Upper

ORION 9mm AR-15

It always excites me to learn of new players and products in the field of AR-15 rifles, carbines and pistols. The latest to catch my interest is the Orion 9mm AR-15 product lineup. It’s common knowledge here on AR-15 TACTICAL that I completely embrace pistol caliber AR-15 carbines, especially those chambered in 9mm.

The 9mm cartridge  is standard issue to many law enforcement for use with duty sidearms, the United States Military M9 pistol and probably the most popular centerfire pistol cartridge in the world. This commonality guarantees easy to locate and inexpensive ammunition for shooters everywhere.

ORION 9mm AR-15 Product Lineup

Orion Guns offers a full line of 9mm AR-15 products that include complete 9mm AR-15 rifles, complete 9mm AR-15 upper receivers, complete and stripped 9mm AR-15 lower receivers and 9mm AR-15 barrels. What is not clear about Orion Guns is whether they actually manufacture any 9mm AR-15 hardware themselves or assemble hardware from other manufacturers. I suspect the answer is somewhere in the middle. The pictures on the Orion Guns website as well as the website appear to be home brew.

Judging from the pictures on the website I suspect Orion is producing 9mm AR barrels and combining them with hardware from other manufacturers as necessary. Nothing wrong with any of this. In fact I praise and encourage them for recognizing a void and diving in. Orion Guns must be doing something right because I learned of them from Brownells. Click here for more information and ordering.

ORION 9mm AR-15 Barrels

The Orion AR-15 Barrels Chambered in 9mm are available in 5″, 8″, 10.5″ & 16″. Made of 4140 Chrome Moly Steel and black nitride finished, these barrels are heat treated and stress relieved. They are stress relieved once again after the button rifling process. All barrels threaded 5/8-24 with a 1-10 twist.

ORION 9mm AR-15 Upper Receivers

Orion offers 9mm AR-15 uppers with the following barrel lengths, 3-inch, 5-inch, 8-inch, 10.5-inch and 16-inch. The uppers are available with knurled tubular, quad-rail and standard two piece A2 style handguards.


  • 5″ 9mm Orion Barrel
  • 1-10 Twist
  • Black Nitride
  • A2 Flash Hider
  • 4″ Ridged Free Float Tube


  • 8″ 9mm Orion Barrel
  • 1-10 Twist
  • Black Nitride
  • A2 Flash Hider
  • 7″ Ridged Free Float Tube


  • 16″ 9mm Orion Barrel
  • 1-10 Twist
  • A2 Flash Hider
  • Ridged Mid-Length Free Float Handguard

ORION 9mm Lower Receivers

The Orion 9mm lowers appear to be assembled to a price point. My preference would be a Hahn 9mm magazine block and KNS anti-rotation pins installed on the lower. Note use the KNS anti-rotation pins on all 9mm AR rifles. Visit our 9mm rifle project that closely resembles the Orion offerings

ORION 9mm AR Lower Specifications

  • Anderson milspec Lower
  • Promag 9mm Magazine Block
  • Made of 7075 T6 Aluminum
  • M4 6 position Stocked lower
  • Installed CMMG Lower mil spec parts kit
  • Buffer & buffer spring installed
  • Add $18.00 each for every 9mm 32 rd mag you want
  • Uses Colt pattern 32 round 9mm magazines (We use Bushmaster colt pattern Metal mags)

ORION 9mm AR-15 Bolt Carrier Group

Orion Guns offers a black nitride coated, standard Colt 9mm AR-15 bolt carrier group. The bolt carrier works with standard AR-15 hammers. The carrier is also Glock compatible. The bolt carrier appears to be CMMG brand.



Olympic Arms AR15 9mm Upper Receiver

Olympic Arms AR15 9mm Upper Receiver

OLYMPIC ARMS AR15 9MM UPPER RECEIVER – Olympic Arms has probably been manufacturing and offering pistol caliber AR15 rifles longer than anyone and they do a great job.Olympic Arms uses a proprietary magazine that fits the AR15 magwell without the need for a conversion block. depending on your view this may be good or bad. Typically 9mm AR15 rifles use magazines based around 9mm UZI magazines. Olympic Arms approach is less expensive and more simple.

OLYMPIC ARMS AR15 9MM UPPER RECEIVER -The ORIGINAL 9mm AR15 conversion assembly. The K9URFT is a complete upper AR15 style receiver assembly chambered in the wildly popular and affordable 9mm pistol cartridge. This upper is 100% complete and ready for installation on any standard mil-spec AR15 lower. Installation is as easy as swapping out the upper receiver unit, and changing the magazine. No mag-well blocks, no need to change the hammer, trigger, or recoil assembly. All the necessary modifications to convert to 9mm are contained in the upper receiver and the magazine. Simply drop this upper on your lower, swap to the appropriate 9mm magazine (one provided with each upper), and you are ready to shoot. Swap back and forth between 9mm and 5.56 in seconds! Safe to use +P and +P+ ammunition.

Standard features include:

  • Forged 7076T6 aluminum Picatinny flat-top upper receiver
  • M4 style handguards (Made in the USA!)
  • Standard GI mil-spec style front sight base
  • Threaded muzzle (1/2 x 28 tpi)
  • Removable Flash suppressor
  • Semi-auto pistol caliber Bolt Carrier Assembly
  • Conical pistol caliber bolt
  • One high capacity 25 round Olympic Arms polymer magazine (Made in the USA!)

This upper uses a direct blow-back operation, and is not a delayed gas-impingement system. Not compatible with other manufacturers 9mm conversions, and is designed to use Olympic Arms magazines. Lifetime Warranty – Warranty handled directly by Olympic Arms, Inc.



Rock River Arms 9mm AR15 Upper Receiver

Rock River Arms 9mm A4 AR15 Upper Receiver

Rock River Arms 9mm A4 AR15 Upper Receiver

Rock River Arms 9mm A4 AR15 Upper Receiver

Rock River Arms 9mm A2 AR15 Upper Receiver

Rock River Arms 9mm A2 AR15 Upper Receiver

Rock River Arms 9mm A2 AR15 Upper Receiver

Sub-caliber upper assemblies allow fast and simple conversion of ARs chambered in .223 to 9mm Luger. True, dedicated, complete upper receivers are assembled from military specification components; includes a Wilson, 1-10 twist barrel, bolt and carrier, charging handle, shell deflector, heat-shield lined handguards, sling swivel, and A1-style flash hider. Additional items not included but required for conversion to 9mm are a 9mm MAGAZINE (739-000-014); 9mm MAGAZINE ADAPTER, 9mm ACTION SPRING, and 9mm RECOIL BUFFER (080-000-442). The part number 739-000-012WB Rock River Arms 9mm A2 AR15 Upper Receiver configuration has A2 adjustable sights regulated for 9mm. The part number 739-000-013WB  Rock River Arms 9mm A4 AR15 Upper Receiver unit has flattop receiver that accepts most aftermarket accessories designed to fit a Picatinny rail.

SPECS: Barrel – 4140 steel, blue, matte finish, 16”(40.6cm) long, .725”(18cm) O.D. Receiver – Aluminum, anodized finish, matte black. Designed to fit lower receiver with .25” (6.3mm) diameter takedown pins.

Rock River Arms 9mm AR15 Caliber Conversion Details

Rock River Arms 9mm AR15 Caliber Conversion Details

Rock River Arms 9mm AR15 Caliber Conversion Details

RRA constantly strives to make improvements to our various product lines. As part of those efforts,
we have made improvements to the factory-built LAR-9 9mm Carbine and the LAR-40 .40cal Carbine,
and in doing so have also made changes to the necessary steps and components needed for caliber
conversions into those platforms.
The first exciting change for late 2014/2015 is the move to a ramped bolt in both calibers, primarily
for use with RRA’s 2-stage trigger kits. This modification requires the use of different hammers in the
LAR-9 and LAR-40 in their single-stage (standard) versions. Please see the diagram (below) for ham-
mer compatibility for the new/current and original bolts and hammers. RRA will continue to offer the
“old” 9mm hammer (9MM0106) for those with the originally-configured bolts.

Conversion of an LAR-15 (AR-15-style) lower to either a currently-configured LAR-9 or LAR-40 has
been simplified by the change in the bolts. In addition to the LAR-9 or LAR-40 upper half and appro-
priate magazine, you will need a magwell conversion block assembly in the appropriate configuration
(9MM0115 or 4S0115). If using a CAR-length receiver extension, a 9mm buffer (9MM0107) is
required for the LAR-9 conversion, while a CAR buffer (AR0107A) can be used with the CAR action
spring in the LAR-40. If using a rifle-length receiver extension, both models still require the above-
specified buffers and CAR action springs (AR0072A) and the addition of a handgun caliber stock spac-
er (9MM0073) behind the spring in the longer extension. Either conversion should work properly
with any of the non-notched hammers (and appropriate additional trigger group components) illus-
trated in the diagram. Depending on magwell thickness in your lower receiver, a 9mm mag catch
(9MM0099) may be needed for proper magazine retention

Conversion of an LAR-15 lower into an originally-configured LAR-9 or LAR-40 (no longer offered
directly from RRA, but there are thousands already in use or otherwise potentially available) is also very
simple. This requires a single stage trigger group with a 9mm hammer (9MM0106… please refer to
the diagram) in the lower, along with the appropriate magwell conversion block assembly
(9MM0115/4S0115). Buffer and action spring configurations are the same as with the new configu-
ration (above). Again, the magwell in your lower receiver will dictate whether or not a 9mm mag
catch is needed (in either caliber conversion).
Conversion of an originally configured LAR-9 or LAR-40 lower half for use with the other handgun cal-
iber upper is a very similar process to the LAR-15 to LAR-9 or LAR-40 conversion. The first step is to
verify which bolt configuration your upper features. Refer to the diagram, and look for the ramping
in the indicated position on the bottom of the bolt, the shape of the bolt, and for the caliber mark-
ings on the side of the bolt. If no ramping or bolt caliber designation is present, you have an origi-
nally-configured bolt. If both are present, you have the new configuration. If you have the new con-
figuration bolt and a compatible trigger group (see diagram) to go to 40cal from 9mm, you will need
an LAR-40 feed ramp (4S0115F), LAR-40 bolt catch (4S0103), and an LAR-40 magazine. If you have
an original configuration bolt, you will need to use a single-stage trigger group with 9mm hammer
(9MM0106), as well as the LAR-40 bolt catch, feed ramp, and magazine. You should already have
the 9mm mag catch in your lower if factory assembled. You’ll also need to replace your current 9mm
buffer with a “regular” CAR buffer (AR0107A). To convert from an LAR-40 to a LAR-9 configuration,
and have the new bolt configuration in your LAR-9 upper half, you will need an LAR-9 bolt catch
(9MM0103), LAR-9 feed ramp assembly (9MM0115F) and appropriate LAR-9 magazine. You will also
need to install a 9mm buffer (9MM0107). If you have an originally configured bolt in your LAR-9
upper, you will need an appropriate single stage trigger group in your LAR-40 lower with a 9mm ham-
mer (9MM0106). You will also need the LAR-9 magazine, LAR-9 bolt catch (9MM0103) and LAR-9
feed ramp assembly (9MM0115F). You will also need to swap your CAR buffer for an LAR-9 buffer
If you have any questions or need additional information, please contact
RRA Tech Support at 866-980-7625 during regular business hours.

Rock River Arms 9mm AR15 Upper Receiver

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