echo 1 makes a nice silencer type. metal body plastic insert. takes 4x aaa. glow bb's are about $25 for 2000 but most people will mix a 4:1 ratio. this is the only occasion i prefure a hicap. put bbs in and give a good shake. no reason u cant do low caps though. put 2-3 as the last shots so u can tell when to reload.
also the silencer tracer has a bad tendacy of giving u away via the strobe.... expecially when no one else has one.
echo 1 tracer can be had for $75.