The P556 SWAT features a 10" barrel, chambered in 5.56mm NATO, with a twist rate of 1 in 7". The flash suppressor uses a standard .5 x 28 TPI thread pattern, ensuring compatibility with after-market accessories. The receiver is made of high strength steel with a durable wear-resistant Nitron finish. The Picatinny rail features a Sig Sauer Mini Red Dot sight. The trigger housing is machined from an aircraft grade aluminum alloy forging with a hard-coat anodized finish designed to survive extreme conditions. The P556 SWAT features a aircraft aluminum quad-rail designed for mounting accessories. The P556 SWAT comes equipped with a smooth two-stage trigger, ambidextrous safety and is designed to accept standard AR magazines.