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Subsonic Striker: Introducing a New Frangible Subsonic .223 from Allegiance Ammunition

By Todd Burgreen

Suppressor use amongst the military, law enforcement and civilians has never been so popular. The benefits of suppressors are hard to dispute, and suppressor manufacturers are expanding production to unimaginable levels. A company contributing to the suppressor marketplace from a different angle is Allegiance Ammunition with its SilentStrike™ ammunition. SilentStrike is notable for its fully functioning frangible subsonic .223 product line-up designed to work with AR15/M4 platforms. There are currently three loads available: 110-grain, 97-grain and 80-grain. Each load offers its own unique performance characteristics.

It does not take a drastic leap of imagination to visualize what roles fully functioning AR-compatible subsonic Allegiance Ammunition would fill. Anything from sentry removal—canine or other—to indoor CQB operations comes to mind. Allegiance’s own literature points out the advantages of such ammunition to, for example, a law enforcement or military team needing to operate covertly while moving through an objective. SilentStrike’s velocity of 975 feet per second eliminates the supersonic crack of the round moving downrange. A quality suppressor eliminates the muzzle signature. The SilentStrike line is not merely about subsonic performance; its unique bullets include such features as frangible tungsten powder cores, which are devastating against soft tissue even at subsonic velocities.

A SIG SAUER SIG516 Patrol AR rifle and SIG SAUER SRD556-QD suppressor were used while evaluating Allegiance Ammunition’s offering. The SRD556-QD weighs 14 ounces, is 6.5 inches long, 1.625 inches wide and offers a sound rating of 134db with supersonic ammunition. SilentStrike requires no modification to the weapon to perform reliably. A standard H-buffer, stock recoil spring and minimum .065–.070 gas port are base requirements that most factory ARs satisfy. A 1:7 barrel twist rate is preferred to stabilize the SilentStrike rounds.

Conversation with Allegiance Ammunition’s Jeff Mullins leaves no doubt about the in-depth product development that takes place with each product. Allegiance is constantly approached by various agencies/units and special operations units to create custom ammunition for specific mission parameters. Not only is a fully functioning subsonic load a challenge; the need to have effective...

This article first appeared in Small Arms Review V21N7 (September 2017)
and was posted online on July 21, 2017

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