Seems the 105mm size gun on the Panzers, M-26 and M-41 are just for the toy gun and for that reason, none of mine fire BBs. Appears to me that these guns could also be made in diffferent calibers to befit the tank on which it is to be mounted. Hey, they really do that on actual tanks! [X(]Business idea; another product line and charge for different caliber guns & types of ammo . [X(]
I can see the fun of shooting toy soldiers, but the main gun is never used against infantry unless you have the proper specific ammo....not a solid slug.[:@] That's why tanks have MGs. IR through the main gun tube would be the best way and insure accurate fire, not as the wide fan I have seen to get it somewhere near the target and acore a hit...or two. Would also teach RC tank
"veterans" that tank combat is not at all like hot rod nitro racers on tracks, uninhibited by speed, weight and the driving and maneuverability restrictions of a real tank.

A secondary IR for the coax and bow MGs would be extremely realistic for use against troops and light vehicles. Also be a teaching tool in selecting weapons for appropriate targets. Embarrasing to get knocked out because you fired your coax against a tiger and got an 88 in return. [:@]
Everyone has their own likes and preferences and those with low velocity BBs can have a ball shooting each other and equally, many want to have IR and mushrooms in the TC hatch. That's what this forum is all about. Don't mean to step on anyone and not meaning to offend anyone by my remarks or ideas, but I am very museum and accuracy oriented and having been in the 1;1 tank shooting business, I like to keep my tank movements accurate as to how it really is.

Modelling is historic accuracy....RC proper handling of the tank is respect to what is was capable of doing. I notice many German RC tankers are on this line of thought.