I have several of the 20mm Berserker MTL tanks and had leaking problems, similar to others, until I noticed an oring in the base that wasn't seating properly and since getting that right, no leaks. So if you have one of these and had leak problems the oring may be the issue.
$12.12 Berserker Mini MTL Styled RTA Rebuildable Tank Atomizer - 2ml / stainless steel / 22mm diameter at FastTech - Free Shipping
Looking at the picks on that Berserker, it looks like it probably has a pretty tight MTL draw. Am I right?
I really like the look of that rta and the deck design but I hate a tight MTL draw.