B&T 3-chamber Compensator type APR for B&T APR cal. .338 LM is an advanced steel muzzle brake dedicated to Accuracy International sniper rifles (and similar) in .338 Lapua Magnum caliber with a mounting thread M19×1 on the barrel. Thanks to the 3-chamber design, it significantly reduces recoil and muzzle rise (much more effectively than 2-chamber versions), improving stability and shot precision without a suppressor, while also serving as a QD base for quick mounting of Monoblock B&T suppressors cal. .338 LM (thread M28×1 LH). It is 100 mm long and weighs about 200 g.