Jaeger Precision says that the RGW RBS SQD Compact Tri Lug Dummy Silencer is a good one to use. This is a 6.4" long, 1.8" diameter black aluminum replica designed to enhance the aesthetic appeal of airsoft guns. It weighs 400g and is compatible with VFC MP5/MP5K GBB, Maruyama SCW-9, RGW MPX 3 lug barrel, and Marui Next Gen MP5 (though modifications may be necessary for installation). This tracer-ready silencer can accommodate 5KU BBP Tracer Modules. Importantly, this is a replica for airsoft use only and cannot be used with real firearms.