Mark 4: Patrol


When selecting a Rail option, please select either a M-LOK Rail or a Quad Rail and select the ‘None’ option on the rail that you do not want.

All Mark 3 and Mark 4 models were tested with the part# 2632 option, and is a mandatory selection.

Mark 3 and Mark 4 models were tested using the H2 Buffer, use for best performance.


A high performing, thin film ceramic coating with unmatched abrasion, corrosion and chemical resistance, and low coefficient of friction.
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Chambered in 6.5 Grendel with a 11.5-inch Alexander Arms barrel: button-rifled, 416 R stainless steel, 1:8 twist rate, 5/8-24 TPI RH muzzle threading, 60-degree muzzle crown, and a carbine-length gas system. We suggest using Hornady Black 123 grain ELD for hunting or self-defense situations. This is our flagship upper that we suggest for multiple uses such as hunting, home defense, or mission and destination unknown situations. This basically can replace the ballistics of a 5.56 but with a shorter PDW-like package. Available with Cerakote E-100 Blackout option for the inside of the Upper Receiver.

Additional information

M-LOK Rails

None (select if selecting a Quad Rail), Bravo 7.5-inch, Bravo 10.5-inch (raw aluminum), Midwest Industries 8-inch, Midwest Industries 10.5-inch, Midwest Industries 11.5-inch

Quad Rails

None (select if selecting an M-LOK Rail), 8-inch Quad Rail, 10-inch Quad Rail

Dust Port Cover

American Flag, Strike Industries, GI Issue