The Operations Manual Information
Performance Information
Theory of Operation
Initial and Secondary Impact Performance
Shipping Information
Shelf Life and Storage
Sales and Order Information

The Maxstop I.R.P. represents years of research and development to create a totally new technology in small arms ammunition unlike any bullet, buckshot or slug ever designed. As the first generation of true "SMART" (target specific proximity) ammunition technology, it transforms the standard police or home defense shotgun into a efficient and safe tactical weapon.

Even though it is not an explosive projectile, it is designed to mimic a military shaped charge round and concentrates all its lethal potential within, or in tight proximity to, the target.

Upon impact the I.R.P. punches into the target and releases a controlled radial energy discharge, creating a highly disruptive focused pressure wave. This pressure wave is entirely responsible for the transfer of energy. Any remaining energy then dissipates rapidly and becomes non-lethal just beyond the target.

In other words, the Maxstop I.R.P. round produces more stopping power with less potential for unintended collateral damage or injuries than any other rifle, handgun, or shotgun ammunition in the world.

The Operations Manual Information
Thousands of rounds of Maxstop I.R.P. ammunition has been fired at test facilities, and law enforcement training facilities throughout the U.S. and Canada, in an effort to evaluate its performance in as many scenarios as possible. All the information listed in this report has been derived from those tests.

Performance Information
The Maxstop I.R.P. is specifically intended for use in cylinder bore, improved cylinder, or modified choked, (choke diameter of .710" or larger) smooth bore shotguns. While optimized for a barrel length of 18 inches, it may be used with good effect in barrels ranging from 14 – 20 inches. It is designed to operate in any 2 ¾" or 3" chambered pump shotgun, and will cycle all clean and well maintained semi-automatic shotguns.

  1. Standard 12 ga. 2 ¾" shell
  2. Weight: 540 gr. Ballistic Polymer Composite Projectile
  3. Avg. Velocity: 1045 FPS (18 in. barrel 10 feet from muzzle)
  4. Max. Breech Pressure: Less than 9,500 psi
  5. Low Recoil: Half the recoil of 9 pellet load of 00 Buckshot
  6. Optimum Range: Up to 50 yd.
  7. Trajectory: 25 yd. = + ½"; 50 yd. = Å ; 100 yd. = - 8 ½"
  8. Accuracy: 4" or less avg. 5 shot group (Center to center @ 50 yd. - 18 in. smoothbore barrel)
  9. Barrel Maintenance: Recommended cleaning schedule every 100 rd. (To maintain optimum accuracy)
  10. Maximum Flight Distance (from level shoulder fired shot): 175 yd. (Compare to M16 Carbine @ 550 yd.)
  11. Optimum Operational Temperature: 0° - 160° F (Temperature of the round itself at firing)
  12. Meets International Wound Ballistics Associations terminal performance criteria: Permanent wound cavity up to eight inches deep and five inches in diameter for both bare and heavy denim clad 10% ordinance gelatin
  13. MAXSTOP IRP should be used only in shotguns with no tighter than "modified" chokes, and not in guns with ported barrels or ported chokes, or "backbored barrels" (barrel diameters larger than SAAMI max for 12 gauge.) Best accuracy has been obtained with  pure cylinder barrels of 18" (or less length when legal).

Theory of Operation
Maxstop I.R.P.
The three components are:

  1. A low density polymer compound projectile body that contains the other components and visually resembles a conventional shotgun wad and shotcup
  2. A 472 gr., 40-50 mesh spherical lead powder core that gives the projectile its mass and ability to create the pressure wave effect
  3. A high density polymer compound actuator located in the nose of the finished projectile, that in profile resembles the standoff device in a shaped charge round and "sets off" the projectile on impact

During the firing sequence a crush zone portion of the projectile body collapses to substantially soften the felt recoil. As it leaves the barrel the crush zone re-expands and the gas seal, at the very rear of the projectile body, opens up into eight stabilizing fins that control the flight of the unified projectile down range.

Upon any appreciable impact, the actuator initiates a very specific timed sequence of events. Within 0.1 milliseconds after impact, as the projectile enters the target, the actuator initiates the separation of the projectile body from the core and itself. During which the projectile body peels back over itself, cleanly releasing the actuator followed by the core.
The actuator then directs the spherical lead powder core into a radial dispersion pattern at a 90° angle to the point of impact. Over the next two to three milliseconds the actuator expands the core up to 3" in diameter, and while comprised of up to 14,000 individual particles, is still operating as though it were a solid object. This results in the capture and propulsion of a tremendous pressure wave traveling ahead of the expanded core at nearly the speed of sound.

The distance covered during this terminal portion of its flight is determined by the density of encountered resistance. In a human target this sequence will take place within eight to ten inches of penetration. In open air, past an initial impact of an automobile windshield as an example, the same sequence may take place over two to three feet of travel. Regardless of the distance covered during this period of time, this represents the optimum terminal portion of the reaction where the most damage is done to the target.

If not stopped by the resistance of the impact, the spherical lead powder core will, over the next several milliseconds, go through its final operational phase. This is the transformation from a potentially lethal solid high density mass, to that of a dangerous but less lethal group of individual minute lead particles, and then finally to just individual particles that are, for all practical proposes, harmless.

The "SMART" (target specific proximity) aspect of the round is achieved through the ability to control the expansion of the spherical lead powder core in "real" time as opposed to "resistance contact" time as with conventional ammo. With Maxstop I.R.P. ammunition once impact occurs, and the actuator "sets off" the round, the timed sequence is the same regardless of the situation. This assures repeatable, reliable performance over a wide range of tactical situations, and maximum stopping power on the target with minimum potential for collateral damage.

Initial and Secondary Impact Performance

Initial Impacts:
The massive energy transfer of this round offers sufficient penetration and tissue disruption to instantaneously incapacitate any individual, regardless of their physical or emotional state, with a single direct hit to center mass.
Full penetration tests on a human sized targets have revealed that, depending on the circumstances, in most cases the projectile could be considered non-lethal to harmless within as little as three feet from the exit point. This allows shots to be taken in very close proximity to hostages or bystanders with minimal risk of unintended injuries.

Secondary Impacts:
Shooting through an initial barrier such as an automobile windshield, tempered glass, residential type partition wall, or interior door creates a secondary impact totally unlike conventional ammunition.

After an initial impact with a car windshield as an example, the Maxstop I.R.P. creates a focused pressure wave that impacts anything up to two feet down range with a tremendously disruptive force.

Unlike conventional ammunition, which tends to punch a small diameter hole into a secondary contact, this focused pressure wave may be up to three inches in diameter and traveling at nearly the speed of sound. This creates an impact our medical team likened to a sledge hammer blow, creating massive debilitating blunt trauma.

  • 25 rounds per box
  • Ten boxes per case
  • Case dimensions: 13 7/8" x 9 ¼" x 5"
  • Case weight: 27 lbs.

Shipping Information
UPS ground from Roberta, GA 31029

Shelf Life and Storage
Maxstop I.R.P. Ammunition stored in a vehicle will be subjected to wide temperature and humidity fluctuations over the course of a year as well as constant jarring and vibration. We recommend rotating this ammunition out annually.
Ammunition cycled through guns before and after each shift, or each day, is some of the most abused and should be inspected frequently and rotated out as wear becomes apparent.

Sales and Order Information
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