Brownells had a new LMT manufactured M203 37mm flare launcher mounted to one of their Retro ARs, and they revealed it’s now up for sale on Brownells website as a stand-alone item, and it’s exclusive to Brownells. The M203 37mm launcher is constructed of aluminum with a MilSpec anodized finish, and mounts and operates just like the 40mm version. The 37mm M203 attaches to standard Government rifle & carbine length barrel assemblies with a .625” front barrel profile, and a GI compatible barrel nut system.