This Sig Sauer P556 SWAT pistol features a 30 round magazine, 10" button rifled barrel with a twist rate of 1 in 7", A2 type flash suppressor with a .5x28 TPI thread pattern, alloy quad rail forearm, high strength steel receiver with a Nitron finish, a picatinny rail with a mini red dot sight, trigger housing machined from an aircraft grade aluminium alloy forging with a hard-coat anodized finish, smooth two-stage trigger, ambidextrous safety, and accepts standard AR magazines.