Yes, there are several but here's just one type but designs are similar -- https://troyind.com/products/claymore-muzzle-brake-762 . IMHO, not as effective as the ones with side ports.
I have the Benchmark tactical brake mini (http://www.benchmark-barrels.com/Ben...le_Brakes.html) being installed on my .300 WSM and should be ready by mid of January.
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