I like what the TC's have to say...... (self included, naturally)
But the RP has a point, especially when talking pre-carves..... so thanks for adding that facet, Rich, yet another layer of complication.
Indeed, with a precarve, if you lower the barrel, you can get in trouble with the wrist getting thinner. maybe 1/16 or 1/8 worst case scenario.
This sport is not for the faint of heart, nor the meek, nor those who want something to snap together. There is often one heck of a lot of puzzling and measuring to get yourself out of a situation.
And, RP, the BP has so much to do with the architecture. Is it the foundation? This is something we could discuss over a beer. I'd say it's the sill, but not the foundation. I would have to concede that it could easily set the whole stylistic tone of the gun. More important than the lock or guard.
Acer