MBC's where devilbiss higher-end 2 piece body... I've painted eleventy hundred cars with one.. I own 2..
JGA's are the other more economy model that was out in those days.. it was a 1-piece and a bit more common.. the mbc's where more money...
kits are still readily available from any decent paint supplier.. tho they may need to be ordered.. being dinosaur tech these days...
the mbc's where always more of a siphon gun like yours is set up...... jga did that, but also worked very well in pressure pot set ups...
now, one important thing I'm leaving out here...
I fought the newer hvlp stuff as an oldschool guy.. loved my mbc's.. it's what I cleared hundreds of cars in the collision shop with...
BUT.. the old guns create a ton of overspray and waste a fair amount of material... and with the cost of paints to day, it's an issue that can't be ignored.. love my old stuff, just really can't afford to use em anymore!!!
on that note, I hate to say it, but a siphon mbc set up would make for a good primer gun these days if set up right.. you could also should shoot a single stage uro thru it easy enough...even clear.. basecoat, no fuggin way...
what # does it have on the aircap up front?