Heartland M4 Full-Auto Military/Law Enforcement Tactical Rifle

Infinity Ammo KARMA Munitions

$ 999.00


This fully-automatic version of our Lightweight Tactical Carbine was developed to suit the needs of military and law enforcement customers. Based on the US military standard, it is a versatile, hard-hitting modern rifle in a scaleable, streamlined and durable package based on the legendary M4-A1 used throughout the US military for conventional and tactical ground forces. All Heartland rifles are made in America under the legendary Karma brand.

With features such as free-floating tactical handguards and low profile gas blocks, these premium carbines carry a modern profile in a light and scalable package. Weighing in at just over six pounds, it is the perfect choice for standard-issue or tactical assault operations.

Whether you choose from our standard Full-auto rifles or customize it to your needs with Suppressors, Grenade Launcher compatibility, etc. the Heartland M4 line of rifles blend rugged durability with exacting precision. The tactical handguard’s slim, octagonal profile sports a full length MIL-STD Top-mounted rail for optics and accessories. Our Upper and lower receivers are hard-forged from 7075-T6 Aluminum for extreme durability, and are made to US Military specifications with a custom Cerakote finish included at no additional charge. All our rifles are made right here in our Melbourne, Florida facility with US made parts. We are a US veteran, family-owned company. We take great pride in offering these quality rifles. Give them a try. You'll be glad you found us!

  • Our 14.5 inch M4 Carbine medium contour barrel is made with 4150 steel and has a Parkerized finish for long-lasting durability. It is designed to withstand the rigors of fully-automatic firing rates. Chambered for use with 5.56 NATO with a 1:7 twist and M4 feed ramps. Barrels come equipped with a flash hider. Barrels are 100% high pressure tested (HPT) with military M197 or SAMMI equivalent proof ammunition.
  • Phosphate coated, lined 8620 steel carrier with phosphate-coated 9310 steel bolt. Bolt Carrier Groups are 100% high pressure tested (HPT) with military M197 or SAMMI equivalent proof ammunition and 100% Magnetic Particle Inspected (MPI).
  • Gas System: Low Profile Gas Block CNC Machined of 4140 hardened steel with Mil-Spec Heavy Phosphate Coating, Carbine length, with Direct Impingement.
  • Ultra-Slim Tactical Keymod Style Handguard, CNC Machined of 6061-T6 Aluminum. Cerakote Finish. M203 Grenade Launcher ready.
  • Custom 6-position adjustable buttstock and ergo-style grips are provided for optimum comfort and fire control.
  • Weight: Standard weight is just 6.3 pounds without magazine (depending on accessories).

Custom never-lube coating available for internals that eliminates the need for lubrication for life!

A wide selection of optics/sights is also available ranging from close combat categories to long distance/match grade sights.

Rifles are warranted against manufacturing defects for a period of 1 year from date of purchase.

Lifetime parts and service support.


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