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Z-M Weapons LR-300

Assault Weapon Conversion Kit [ 2005 ]

Z-M Weapons introduced a conversion kit for AR-15-style weapons to produce the more compact, tactically-minded LR-300 series.

Authored By: Staff Writer | Last Edited: 07/22/2016 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

In 2000, Z-M Weapons of Bernardston, Massachusetts (USA) developed a conversion kit for AR-15-based weapons to produced the "LR-300" tactical automatic weapon. The kit provided a revision to original AR-15-style assault weapons by revising the direct gas-impingement system so an all-new, side-folding adjustable skeletal stock could be used (replacing the M16-style cylindrical recoil buffer tube in use). These changes allowed for increased compactness of the weapon which is always an appreciated quality of some long guns. An optional length of Picatinny rail could also set above the upper receiver for support of tactical accessories such as optics and aimers. On the whole, the form and function of the AR-15 weapon remained largely the same though the kit's reception was met with mixed results.

Four major versions of the kit - two to serve the military / law enforcement market and two to serve the civilian / sporting market - were made available: The LR-300 ML-A was developed for military / law enforcement circles and included an 11.5" barrel assembly and selective-fire modes. Similarly, the LR-300 ML-N has an 11.5" barrel with selective-fire, optional Picatinny rail, and Nylatron forend (the latter replacing the aluminum forend). The LR-300 SR-A for the civilian market was a semi-automatic-only model with 16.5" barrel length. The LR-300 SR-N followed in semi-automatic-only fire mode and included the Nylatron forend and optional Picatinny rail.

The rights to the product were sold off to Para Ordnance in 2009.©MilitaryFactory.com
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Service Year

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United States


Assault Weapon Conversion Kit

Z-M Weapons / Para Ordnance - USA
(View other Arms-Related Manufacturers)
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(OPERATORS list includes past, present, and future operators when applicable)
Automatic Function
Features a mechanical function to automate the firing action.

Overall Length
546 mm
21.50 in
Barrel Length
292 mm
11.50 in
Empty Wgt
6.83 lb
3.10 kg

Optional Optics


Gas-Operated, Rotating Bolt

Rotating Bolt
System utilizes internal mechanism to lock the breech or rear barrel assembly prior to firing.
Gas-operated system is featured, typically involving a gas cylinder and rear-driven piston directing energy to the bolt component.
(Material presented above is for historical and entertainment value and should not be construed as usable for hardware restoration, maintenance, or general operation - always consult official manufacturer sources for such information)


5.56x45mm NATO

Sample Visuals**

Graphical image of a 5.56mm intermediate rifle cartridge
Rounds / Feed

30-Round Detachable Box Magazine
Cartridge relative size chart
*May not represent an exhuastive list; calibers are model-specific dependent, always consult official manufacturer sources.
**Graphics not to actual size; not all cartridges may be represented visually; graphics intended for general reference only.
Max Eff.Range
985 ft
(300 m | 328 yd)

LR-300 - Base Series Designation of conversion kit
LR-300 ML-A - Military / law enforcement form; aluminum forend; selective-fire.
LR-300 ML-N - Military / law enforcement form; Nylatron forend; selective-fire; Picatinny rail.
LR-300 SR-A - Civilian market form; aluminum forend; semi-automatic fire only.
LR-300 SR-N - Civilian market form; Nylatron forend; semi-automatic-fire-only; Picatinny rail.

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