Midwest Industries 336 Hand Guard Adaptor, Fits Marlin 336 and 1894 with Barrel Bands, Allows Installation of Midwest MLOK Handguard, Anodized, Black MI-MAR336A Midwest Industries is proud to announce the Marlin 336 Hand Guard Adaptor. This easily installed adapter allows the end user the ability to add the Midwest Industries M-LOK Rail to their favorite Marlin 336 or 1894 Rifle.