Well, if you're content playing vertical bottle you don't even need any of that stuff. That marker is good to go out of the box.
Now for the BAD news. The BDC has a unique nonstandard bottomline mounting. You'll need an adapter to fit a bottomline on there, unless you plan on custom drilling/tapping either the gripframe or a dropforward rail long enough to take an extra hole. I bet the LAPCO bottomline would work, provided you trust yourself with a powerdrill.
Well it has a verticle adapter, you just can't put a low pressure chamber on it...so if you wanted to put a low pressure chamber on it, then you'd need a different verticle adapter. as for a bottom line, you need the adapter block they have for 6.95 because the compact has some funky holes in the bottom, not staggered or inline..okay bye
Ehh, you on the one you linked, it comes with an ASA. You can screw your tank right into that. OR you can buy a bottom line adapter and an adapter block. Then you'll need a gas-thru foregrip or a regulator or something.