Kicking Ass From The Air

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The daily mail published photos of a Royal Air Force aerial security team deployed in London for the Olympics. The rifle is the British standard Accuracy International L115A .338 LM sniper rifle, resting on a nifty swivel mount.
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The Benelli M4 shotgun, equipped with a EOTech holographic sight, is very interesting choice for aerial operations in a densely populated city. Mounted underneath the shotgun is what must be either a long range laser sight or a non-lethal laser dazzler. Can anyone identify the device? I would love to know what ammunition the shotgunners are packing, it must be a type of long range slug.
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17,000 servicemen and woman from all branches of the MoD will be descending upon London during the Olympics (for comparison purposes, the British deployed 14,000 troops during the Korean War). I think it is safe to say London won’t be invaded between 27 July and 12 August, aerial shotgunners or not.