Which expansion chamber for 68 Classic?

[stoupa]

Hi,
I'm new to AO and I hope to get some info from the more experienced
I'm going to buy an used Automag (image is attached.)
Does anyone know what kind of expansion chamber it has? I was thinking of a replacement, but I have chosen two chambers i like and I don't know which to choose.

Lapco Expansion Chamber - i found no reviews on pbreview.com Did someone try it already?

http://www.lapcodirect.com/shopone/ProductDetail.asp?prod_id=1045&CatId=4

ACI Sub-Zero, they got good ratings. 6 stage is better than 4, right? Is it this simple?

http://www.airconcepts.com/ACI_Ecom-Website/Stuff/ExpansionChmbrs/ExpanCh.html

thanks for help,
Stoupa

[Cool fool!]

the aci one is great. i had that on my automag for a few years... than i bought the more flashy dye gas thru.