This'll be a quick little footnote compared to my other many articles. This is concerning players who think muscle & bone lace, muscle grafts, and other BODY score altering methods also increase the gun size you can place in your body.
Gun size is based more on your frame than on your strength. Think about it this way, a midget might have a body of 10, but there is no way all the equipment for a shotgun, even a folding one, will fit in his body. (By the way, when dealing with midgets, -1 to be hit, MA max: 6, +1 REF with 10 max, all conceilabilities from Jacket are lowered 1 rank. J > L, L > N, N > N.) I usually recommend 2 different scores concerning BODY, however, I now prefer to actually have a height and weight written down. This'll better represent your character's frame. Getting back on track though, the big point I want to make is that if your character's starting BODY is a 6, and then using Muscle & Bone Lace becomes 8, your character can still only pack AVERAGE classed gear into his body (not the new STRONG class materials).
Your body shape hasn't changed, only the strength of the bone and muscle.