I just got the silenced SCAR-L from the xcalibr munitions shop and i'd like to test out the unsilenced version too.

Can I find that guns base id, via FO3edit or somesuch, so I can spawn one?

You can get the FormID with FO3Edit, just make sure to replace the first two digits with the load order position of the particular mod. You can get this with bash or FOMM.

As to the console command, I've never used it in Fallout but it's probably the same as Oblivion:

player.additem xxyyyyyy z

where xx is load order position, yyyyyy is the last 6 digits of the FormID and z is the number of the item you want added to inventory.

Thanks, it even spells out the load order position when I looked at it.