Check the listing for details. 9 m.m 1/2x36 Thread Muzzle Brake Compact Competition Knurled Finish FREE WASHER. Condition: New. Listed at 11.85 USD. 9 m m 1/2x36 Thread Compact Competition Muzzle Brake Knurled Finish FREE WASHER US Specifications Featureless Short Compact Muzzle Brake Knurled Surface Cost and Functional Effectively Come With Free Crush Washer Length: 1.59'' Outside diameter : 0.92'' Weight: 2.75 oz Return policy - Satisfaction Guaranteed!(30-days) Customer satisfaction is our top priority. So please give us Positive Feedback. Please give us a chance to resolve any issues before posting a feedback. Please contact us with any questions or concerns. SHIPPING All items will be shipped in 24 hours as soon as your payment clears. We use the United States Postal Service (USPS) Priority Mail or UPS for all shipping We only ship to USA. No international shipping.