You have various options which all depend on your preference in travel distance.
Go with the silky smooth Unga Bunga Stem paired with JWK bottom housing if you do not mind a 2.7mm total travel. Kailh Black stems paired with JWK bottom housing equates to around 3.4-3.5mm total travel (but will be the scratchiest of all the options). The Average Joe stems paired with JWK housing equates to a travel of 3.1-3.2mm total travel. Our Average Joe Light-Tactile stems are available if you would like to turn your MX Brown into a smoother long pole typing experience.
Black Cherry Pie Assembly
Please add "Frankenswitch Assembly" 'X' amount of times, per the number of BCPs you would like to have assembled.