The best expansion chamber

[Lord Delta]

What is the best 4 stage expansion chamber on the market?
What is the best 4 stage expansion chamber for under $50 ?

[SIGSays]

just get the aci 6 stage xpansion chamber for like $40. i think the xpansion chamber is a sub-zero. has 2 more stages to expand. but if you want a 4 stage get the aci 4 stage xpansion chamber for like $30-$35. i think......