Considering Subspace Encased Particle Cannons, Anti Neutron. and Positron Weaponry also have the shield piercing effect, and are also DR 9, I don't see a problem to be perfectly honest. All things considered, while I am a fan of all three types of weaponry, diversity in our armaments should be encouraged, built, and improved upon. This while I may seem arrogant by saying, is a unique weapon system considering most rely on anti matter or aetheric power. And yet this is to my knowledge the first of its kind.