I shall say no more on Ambush then until I know more. Though if they are shredding Pumas, it sounds like their Penetration hadn't been tuned properly. I'm sure Relic will fix this eventually. Being Silenced Stens, they should realistically have very low penetration as silenced weapons always have a weaker punch than normal. I'm sure that's where Relic will go with this.
I imagine that the Bren Gun will have more punch against Light Vehicles, should the Commandos require it without sacrificing anti-infantry capability. Hell, maybe they'll even fire on the move like USF Paras and OKW Obers!
Er game mechanics lesson time. Many small arms have a penetration of 1. Puma has front armor of 25. 1/25 = 0.04, 4% chance for one bullet of said small arms to penetrate puma armor. As the sten is an SMG and fires in bursts, and there is a squad of stens, (and small arms cant miss at shooting at vehicles), the commandos, as well as any other squad with assault rifles/guns/lmg's will do damage vs light vehicles such as the puma. Its just that the ambush bonus in Alpha made it capable of doing dozens of damage in short time vs puma's 400 health. Also, people claimed PIATs also benefited from ambush bonus, meaning commando PIATs blew up armor very rapidly. Also, various weapons of different calibre all have the same penetration because its orderly, so stens will be the same. Pointless for a weapon to have less than 1 pen.
Brens are UKF BAR's. Except obviously they are LMG's instead and are best on IS's. Only paratrooper M1919 upgrade for paras and LMG34 upgrade for obers allow firing on the move, but Brens are still NDA, as well as PIATs, and this is a Commando thread...