By: Friedrich Seiltgen

Copyright © 2022

Maxim Defense is a U.S. based firearms development company centered on producing better, lighter, and more reliable firearms and accessories that exceed in today’s most extreme environments.  Maxim has been knocking out a line of excellent PDW carbines in assorted calibers for some time now.  In response to a USSOCOM need, they put their engineering prowess to the test and came out with a large frame, SR-25 pattern style rifle, chambered in 6.5 Creedmoor or .308 Winchester, the MD:11!

Maxim Defense Press Release:

“Maxim Defense Industries is proud to announce the launch of their new direct impingement large frame MD:11 series, a rifle based on the SR-25 cut pattern.

“The MD:11 is an updated variant of the original Stoner AR-10 design.  The Direct impingement system still functions like most. There has been no serious change to the inside of the upper receiver; the gas tube forces all that gas into a key screwed atop the bolt carrier group.  The gas expands inside the BCG, forcing it backwards into the buffer tube.  There is no ‘chamber,’ but more of a diversion like the original design.”

The MD:11 will be available in 6.5 Creedmoor or .308 Winchester utilizing an 18 in.  Proof Research carbon fiber or stainless-steel barrel.  Using these barrels keeps the weight down to just 9lbs.  This weapon was initially designed for United States Special Operations Command (USSOCOM) requirements. However, once the decision was made to commercialize the SOCOM requirement (within limits), 6.5 Creedmoor and .308 Winchester were deemed the best calibers.

It also comes standard with a carbine buffer system, B5 SOPMOD stock, and utilizes the Gisselle SSA-E trigger.  Initially, they are available in three colors: Urban Grey, Arid, and Black.


Maxim Defense uses MILSPEC+ coatings and materials for the billet 7075-T6 receiver set, which has an ambidextrous charging handle, a selector switch, and a magazine release for the lefties out there.  The Geisselle SSA-E trigger has a pull of 2.9 to 3.8 pounds (Sweet!), and the MD11 utilizes all SR25 type magazines.


The 18” proof research barrel on the MD11 can be ordered in either carbon fiber or stainless steel, which helps keep the weight down to nine pounds.  There’s a 15.5-inch handguard with a full-length M1913 Picatinny rail on top and M-LOK slots on the bottom and sides so you can mount sights, optics, lights, lasers, MAWLS, and Bi-pods.


Action Type: Direct Impingement

Caliber: .308 Winchester / 6.5 Creedmoor

Magazine capacity: 20 Rounds

Sights: Full length M1913 Picatinny rail for you choice of sighting

Barrel Length: 18 Inches

Overall Length: 37 Inches

Weight: 9 pounds

MSRP: $3,895 to $4,295



Another excellent weapon from the folks at Maxim Defense.  This rifle was designed for the Special Operations Community.  Do you think Tier One operators are going out on missions with substandard weapons?  Get down to your Maxim Dealer and check out the MD:11!

That’s all for now folks!   Please keep sending in your questions, tips, and article Ideas.  And as always – “Let’s Be Careful Out There”

Friedrich Seiltgen is a retired Master Police Officer with 20 years of service with the Orlando Police Department.   He conducts training in Lone Wolf Terrorism, Firearms, and Active Shooter Response.  His writing has appeared in RECOIL, The Counter Terrorist Magazine, American Thinker, Homeland Security Today, and The Journal of Counterterrorism & Homeland Security International.  Contact him at