Guns Sig Sauer SIGM400 Enhanced Sweepstakes Recoil Staff June 6, 2012 0 Comments Sig Sauer has a new sweepstakes for June 2012 where you could win the new SIGM400 Enhanced AR Rifle. The SIGM400 Enhanced features a direct impingement gas system, A2 front sight, flip up rear sight, QD ambidextrous sling mounts, and Magpul MOE: stock, grip & forend. The barrel is chrome lined and has a 1:7 twist. The SIGM400 Enhanced is chambered in 5.56mm x 45 and has an MSRP of $1,120. No purchase is necessary to enter the sweepstakes. To enter and see the official rules click HERE.