Check the listing for details. Ruger 10/22 Muzzle Brake .22LR 1/2-28 Linear Compensator Knurled Muzzle Brake. Color: Black, Condition: New. Listed at 34.99 USD. Length: 2.75" OALDiameter: .8995"Exit Hole: .253" Weight: 5oz Threads: 1/2-28Machined From Carbon Steel C1045 Heat TreatedBlack Nitride Finish For A Ruger 10/22 10-22 1022 10 22 Ruger American Ruger Charger .22LR Compatible With 10/22. NOT Ruger Product6 Machined Ports Redirect Blast Forward And Away From Your EarsIncludes 1 1/2" Appropriate Crush Washer Please Ensure Your Barrel Is Threaded 1/2-28 Before PurchasingOnly One Brake Included, Two Shown For Picture Demonstration Purposes Only Plagiarism We Work Hard To Give You Unique And Detailed Photography AND Descriptions. After All, We Too Are Enthusiasts, We Live The Lifestyle. So Don't Bite Our Listing, Don't Copy Our Hard Work. If You Are Caught Copying Descriptions And Pictures, We Will Report You To Ebay And The VERO Program. PaymentsWe accept payments through Paypal and all major credit cards. Immediate payment is required on all orders. CA residents will be charged a 9% sales tax to their order. ReturnsWe offer a 30 day return policy. Buyer pays for the return shipping cost.Returns must be in 100% brand new unopened condition.We ship 5 days a week, Mon-Fri during business hours 9-5pm PST, and Saturdays we come in to ship orders out to prevent delays. We ship within 24 hrs if it is a business day.