ODIN Works DMR XL AR-15 6mm ARC Rifle Gas System 18in 416R Stainless Steel Barrel Rifle Length 1-7.5 Twist 5/8-24 w/BCG. Specifications for ODIN Works DMR XL AR-15 6mm ARC Rifle Gas System: Manufacturer: ODIN Works Finish: Stainless Steel Fabric/Material: Steel Caliber: 6mm ARC Barrel Length: 18 in Barrel Profile: DMR Threads per Inch: 5/8-24 Barrel Twist Rate: 1-7.5 Barrel Material: 416R Stainless Steel Gun Model: AR-15 Additional Features: Non-Threaded Gas Block Journal Size-Length: 0.750 in Gun Type: Rifle Package Contents: ODIN Works DMR XL AR-15 6mm ARC Rifle Gas System What firearm models does the manufacturer say ODIN Works DMR XL AR-15 6mm ARC Rifle Gas System is compatible with? The manufacturer suggests that ODIN Works DMR XL AR-15 6mm ARC Rifle Gas System is compatible with AR-15ODIN Works B-6MM-18-ARC-2R-TG-BCG: DMR XL AR-15 6mm ARC Rifle Gas System 18in 416R Stainless Steel Barrel Rifle Length 1-7.5 Twist 5/8-24 w/BCG