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MK III Modular Hand Guard
   Length: XXL (17.25" OAL)
   Platform: Armalite AR-10, pre-2010 Bushmaster, Rock River LAR-8 or similar
   Tube Style: RC

Machined from 6061 T6 aluminum with a 4140 steel barrel nut, this hand guard includes two JPHGS quick-detach sling studs.


Receiver Thread Pattern: 1 7/16" x 18 TPI
Max. Compatible Barrel OD: 1.2"

Inside Diameter: 1.75"
Outside Diameter: 2"
Overall Length: 17.25"
Weight: 4.912 oz.(barrel nut) / 10.384 oz.(tube)
Color: Matte black hard coat anodizing or custom color Cerakote


Large-frame MK III Hand Guard models make use of an eccentric nut design whereby the barrel retainer nut is not centered in the receiver extension. This allows use of the same smaller 2" tube as our small-frame hand guard models rather than requiring a larger diameter. At the same time, this design does cause the barrel to sit slightly below center in the hand guard tube. This is purely an aesthetic characteristic and does not affect barrel-tube parallelism or durability.

Tactical Rail Selection

Any rail segments purchased at the same time as MK III Hand Guard are available at 20% off when selected from the the menus at right. All rails are anodized black regardless of any color option upgrade.

Full-length 12:00 rails or the 2-inch front sight rail (JPTR-FS) can be attached directly to the top of the hand guard tube while two- and four-inch accessory rails can be mounted directly (without backer plates) to the tube at the 6:00, 3:00, 9:00 and 45° positions using the 10-32 flathead screws included with the rail segments. Refer to the table below to determine which rails you need for a given application.

Tube Position JP Tactical Rail
3:00, 9:00 and 45° JPTR-LRC, JPTR-SRC

Patents: 8,839,545
Product Instructions

12:00 Rail - 20% Off:

Accessory Rail 1 - 20% Off:

Accessory Rail 2 - 20% Off:

Price: $259.95