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General | Ordering | Accessories | FAQ

GMR-13

Whether as a complete carbine, upper or lower assembly, the GMR-13™ 9mm is a versatile platform that excels in both function and accuracy. The GMR-13™ is available with either our JP-15™ or PSC-11™ upper receiver for a blowback-operated carbine that includes our 9mm Silent Captured Spring standard. The end result is a system that cycles with virtually no recoil, allowing for extremely fast sight recovery with solid 3 MOA accuracy from a pistol cartridge usable out to 100 yards.

With the high-performance ammunition available from many manufacturers, the GMR-13™ makes a solid choice for a competitive match carbine (especially considering the cost savings of 9mm ammo over .223) and is also well-suited to home defense applications given its impressive .357 magnum-comparable ballistics with a carbine-length barrel. The lack of concussion in enclosed spaces and greatly limited over-penetration issues when compared to most rifle cartridges only enhance its suitability in this arena.

Designed from the start with the needs of law enforcement in mind, the GMR-13™ accepts the same G17 pistol magazines as Glock 9mm pistols for carbine/sidearm compatibility and is also available in select-fire configurations. Built on the PSC-11™ upper receiver platform with its dual charging systems, the GMR-13™ readily accommodates those with training backgrounds on either the HK or AR-15 platform. Also available for military and law enforcement, the complete rifle package includes our own JP select-fire trigger setup for precision trigger control in both semi- and full-auto modes. As with all JP rifles, the GMR-13™ comes with parts and service readily available from a trusted US manufacturer.

Base Carbine Specifications:

Receiver: Machined-from-billet 9mm lower with forged JP-15™ upper or machined PSC-11™ dual-charging upper ($500 upgrade)
Receiver Finish: Matte black
Barrel: JP Supermatch™ air-gauged, button-rifled, cryogenically treated barrel (1/2" x 36)
Barrel Finish: Magnesium Phosphate
Muzzle Treatment: JP tactical or standard-profile compensator
Caliber: 9mm
Buttstock: ACE ARFX or Tactical Intent TI7 collapsible carbine
Grip: Optional
Hand Guard: JP MK III Hand Guard System
Operating System: Blowback with JP 9mm Silent Captured Spring
Trigger: JP Enhanced Reliability Fire Control Package with a weight of 3.5-4 lbs.
Accessories: JP accessory pack including operator's manual, backpack soft case and more

GMR-13™ Rifle
Base Price: $1499

Go to Rifle Builder

GMR-13™ Upper Assembly
Base Price: $799

Go to Rifle Builder



Receivers | 9mm
MBRG13LR-K1GMR-13 9mm Lower Receiver Kit$399.95

9mm Components and Accessories
JPTC-9MMTactical Compensator
   1/2-36 TPI (9mm)
   .850 OD
   .406 Exit
   Matte Black
$59.95
JPTRE3-236B3-Port Compensator
1/2-36 TPI
.750 OD
.406 Exit (9mm)
Matte Black
$99.95
JPTRE3-236S3-Port Compensator
1/2-36 TPI
.750 OD
.406 Exit (9mm)
Polished Stainless
$99.95
JPBC-9MMAJP Enhanced 9mm AR Bolt

New Generation
$249.95
JPSCS2-9MM9mm Silent Captured Spring
GEN 2
$159.95
JPBC-9MM-SCS2JP Enhanced 9mm AR Bolt with Gen 2 JPSCS2-9MM

New Generation
$385.95
JPFP-9MMJP 9mm Firing Pin$14.95
JPS-9MMFPJP 9mm Firing Pin Spring$2.49
GL-9MM-10R10 Round 9mm Glock 26 Magazine$24.95
GL-9MM-17R17 Round 9mm Glock 17/34 Magazine$24.95
GL-9MM-31R31 Round 9mm Glock 17/34 Magazine$39.95
RR9MM 0115Rock River Arms 9mm Mag Well Conversion Block$175.00
RR9MM 0116A32-Round 9mm Magazine$35.00
RR9MM 01079mm Carbine Buffer$25.00
JPS-OSC.308Custom Centerless Ground and Polished Operating Spring
Platform: Large-Frame
Length: Carbine Length
$22.95

FAQ

Does the GMR-13 have any ammo requirements or preferences?

For ammo and loading recommendations, see the current version of John Paul's loading document.

Some newly manufactured 9mm ammo available may have overcrimping issues that can potentially cause catastrophic failure in a blowback 9mm like the GMR-13. It is vital that you recognize the warning signs of such a failure. Please review our Warning for 9mm Carbines.

How will the GMR-13 handle +P ammo?

The GMR-13™ action is straight blowback and was calibrated with standard-pressure loads. It has not been tested with Corbon +P ammo. The bolt does not lock during firing, so the primary effect of shooting high-pressure loads is that the bolt will open faster, making your immediate risk that the cases will bulge or rupture because of this. In the long term, you will see a bit more wear and tear from the extra bolt velocity. The 9mm AR is known for being abusive to the hammer pin but we minimize this by using a ramped bolt. Thanks to this and our anti-walk pins, we have not had any hammer pin failures to this point.

Why doesn't my non-JP trigger reset with the JP 9mm bolt assembly?

Like most all of the 9mm bolts on the market, our bolt assembly is ramped in order to reduce hammer wear during the re-cocking point of the firing cycle. The bottom of a 9mm bolt also doesn't come down quite as low as a standard bolt carrier. These two factors together tend to cause the hammer to not be pushed down quite as far as when cycling .223. JP fire control components as well as Mil-spec ones do not experience this problem, but certain other trigger components will not function with 9mm bolts even though they are fine for .223.