Sig Sauer 556XI SWAT 5.56 Rifle-Sig Sauer 556XI SWAT 5.56 Rifle Caliber: 5.56mm NATO Overall Length: 35.8 in / 912.9 mm Rifling: 1 in 7in Number of Grooves: 6 Barrel Length: 16.0 in Accessory Rail: Yes Options: Swiss-Style Folding Stock with Removable Cheek Rest, Ambi Controls, Locking Flip-Up Sights, Also Available with a Aluminum Handguard BRAND NEW! NEVER FIRED! CASH ONLY! NO TRADES! PRICE IS OBO