[Drakker]

Good options are all Laylax, all PDI or all EDGi. You will have a much easier time if you stick to a single manufacturer. Laylax is more silent, PDI is a bit more durable and EDGi is in in between noise levels. If you'd like a stiffer trigger, get the PDI V-Trigger, its overall a better trigger unit and it has replacement parts available. The Laylax zero trigger has a lighter pull but its a bit smoochy. The EDGi kit uses the regular Marui trigger unit with stronger sears, so the trigger pull will be similar to stock.