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Hi it is Rifling: 1 Turn in 8" – Right Hand Twist Caliber: .223 Rem. Type: Rifle Action: Semi-Automatic, Gas Impingement System Capacity: 5 + 1- 5 Rd. Compliant Fixed Magazine & Bullet Button Safety: Manual Lever with Indicator Markings on Both Sides of Receiver Receiver: M4A4 Type Flat Top Upper Receiver with Optics Riser Blocks Receiver Material: Forged 7075 T6 Aircraft Aluminum with Aluminum Trigger Guard Receiver Finish: Hardcoat Black Anodize Finish Bolt Material: Carpenter 158 Steel Barrel: 20" Stainless Steel – Fluted – Matte Finish Barrel Material: Precision 416R Stainless Steel Chamber: Compass Lake Spec. with Matched Bolt Rifling: 1 Turn in 8" – Right Hand Twist Stock: Skeleton Stock with Sling Swivel Forend / Pistol Grip: Knurled, Vented Aluminum Free-Float / Hogue Rubber Grip Rear Sight: None – Ready for Optics of Choice on Picatinny Rail Platform Front Sight: None – Picatinny Rail Platform Packaging: Hard Plastic Gun Case with Black Web Sling & Operators Manual

Windham Weaponry Varmint Exterminator 5.56/223 20" SS Fluted Barrel, ... steel, fluted barrel, matte finish, and 1:8 inch right hand twist rifling. Depending on the 80 - 90% seems like a good deal. I would see what Buds can offer on this : https://www.budsgunshop.com/catalog/product_info.php/products_id/80444/Firearms/Rifles/Windham+Weaponry/Windham+Weaponry+R20FSSFTSKV+Varmint+Semi-Automatic+223+Remi

Most are 1in 8 but without the correct model number I cant say for sure Buds model number does not cross to anything I could find