The MGI Survival Package — Four Popular Calibers in One System

By Dave Dolbee published on in Firearms

The Hydra – One Weapon, Multiple Configurations

Are you a casual shooter, serious competitor or firearm collector? How about someone who takes survival and preparation seriously? Regardless of the type of shooter you are, MG Industries has, quite possibly the last, platform you’ll ever need (want is quite another topic).

In recent years, manufacturers have been increasingly offering new designs capable of being easily converted to shoot a variety of calibers. Arguably, enthusiasm from the survivalist community has led the effort to spread the word and garner support for these designs. However, with the stagnant economy and shooters’ desires for versatility, MGI’s “Hydra” platform has carved a niche that distinguishes its design apart from what we commonly perceive in an AR-15.

MG Industries Survival Package combines four calibers—popular with casual shooters and survivalists alike—in one easy to use and easy to transport package. The Survival Package is professionally laid out in an ultra tough, lockable long gun case with strategically positioned foam cutouts to securely hold each piece of equipment for quick assembly and stowage.

MGI’s Survival Package is built on the MARCK-15 “Hydra” platform. The base system starts from a 9mm with a modular lower receiver, 9mm magazine well, CQB-D upper receiver, 16-inch bull barrel and 9mm Colt-style bolt. From there, the package is expanded to include three of the most popular calibers (for military and survival) on the market: 5.56 NATO, 7.62×39 and .300 Blackout.

MG Industries Survival Package MARCK-15 rifle

MG Industries Survival Package combines four calibers—popular with casual shooters and survivalists alike—in one easy to use and easy to transport package.

The 5.56 NATO conversion package includes the 5.56 barrel, complete bolt carrier group and the AR magwell. The 7.62×39, or AK-47 conversion kit, comes with a 7.62×39 barrel, MGI’s enhanced 7.62×39 bolt and firing pin installed in MGI’s modified bolt carrier and AK-47 magwell. A complete .300 Blackout barrel is also included and ready for use.

According to MGI, the MARCK-15 Hydra is the only truly modular rifle that can convert into multiple calibers in seconds. Designed by an industry innovator and veteran, the MARCK-15 may well be the last rifle you will ever need. However, should you feel the need to add additional calibers, the MARCK-15 Hydra is available in most, if not all, of your favorites.

The MARCK-15’s unique design handles all three methods of operation: blowback, impingement and gas. For those who blessed few prepared to go full auto, the quick barrel-change capability will keep you rock and rollin’. When one barrel gets too warm, you can swap out a spare in less than 30 seconds and resume sending lead down range.

The MARCK-15 would certainly fit into most any home defense, survivalist or casual shooter’s collection and the variety of calibers offered has a lot of appeal and application. Personally, I could see a MARCK-15 in .450 Thumper sneaking into the gun safe one of these days. I don’t really know why, but I love the thought.

How would you configure the MARCK-15? Would you go with the Survival Package or is .450 Thumper more your style? Tell us in the comment section.


Growing up in Pennsylvania’s game-rich Allegany region, Dave Dolbee was introduced to whitetail hunting at a young age. At age 19 he bought his first bow while serving in the U.S. Navy, and began bowhunting after returning from Operation Desert Shield/Desert Storm. Dave was a sponsored Pro Staff Shooter for several top archery companies during the 1990s and an Olympic hopeful holding up to 16 archery records at one point. During Dave’s writing career, he has written for several smaller publications as well as many major content providers such as Guns & Ammo, Shooting Times, Outdoor Life, Petersen’s Hunting, Rifle Shooter, Petersen’s Bowhunting, Bowhunter, Game & Fish magazines, Handguns, F.O.P Fraternal Order of Police, Archery Business, SHOT Business,, and others. Dave is currently a staff writer for Cheaper Than Dirt!

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Comments (18)

  • Shawn Malphurs


    What about optics?. Changing caliber is great and all but the one optic on the top is not gonna be accurate for all the calibers. Seems like a waste. I’ll stick with my AR and different uppers with the optics configured for that caliber


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