Let's talk magwells a minute. I really love the looks of a well-done one. The way I do them it gets pretty 'spensive, and I've always been the first to admit that for $69.00 (or whatever they cost now), you get a lot of magwell area increase from an S&A magwell. They are a little rough in some areas but again, for the price.... if we're talking, say, price per square inch of available area to shove a mag into, they are a tenth of the cost. I have used them in the past on high-end custom guns when it's what the customer insists on, but to get an S&A up to snuff enough to be part of a high-end custom is quite a bit of work in itself. They are made to fit any gun ever made, so are generally very loose. This might not be a problem until a perfect match is attempted between the funnel surfaces of the magwell, and those of the frame itself. This cannot be achieved if the S&A magwell can rock left and right .050 or so at the forward tips, so, first order of business, take out the slop. Peening up some space-taker-uppers is one way, or TIGing it, or sliver-brazing some pieces in. They are usually loose side-to-side as well as fore and aft.
Then there's the mainspring housing retaining pin hole. On the S&A they tend to be pretty generous to accommodate the many different places the mating hole in the frame might be. I have most often wound up reaming it oversized, silver-brazing a plug in, and re-drilling the hole then reaming it to exactly .1562, in exactly the location it needs to be to match the location of the frame's hole. Lastly, the checkering on them is cast- in.... pretty functional but not the stuff magazine-cover guns are made of. So-- again, a good value at a certain level of "custom", practical and utilitarian, but to use one for a really fine custom gun, well, it's a lot of extra work.
A weld-on magwell has more to offer but to get it we have to cross the "you don't get something for nothing" line. Generally speaking, you get more magwell area, and no added length to the gun-- although I'd say many of the guys I've seen using the S&A, part of the reason they like it specifically IS the added length of the mainspring housing. Depending on whose weld-on you're using, it may or may not be wider than the grips. Of course it all depends on the user's likes and requirements--for example, on an S&A, the extra length adding comfort for some larger hands, vs/ the compromise in concealability. Weight-wise, the dif would be indiscernible.
So-- a few pics of magwells, going from one in-process to some recent ones and then older.
First, in process for Rob Donaldson, about whom I've written before here on LTW. Made by me from a block of US-made pre-hardened 4140. This is a piece of steel from Crucible, a company that used to be part of Colt Industries. I've used this or prehard 4130 since my first one in about 1988 and it has been a good material choice as it closely duplicates what a carbon steel 1911 frame is made of. I have a decent chunk of this Crucible stuff right now so it goes in the saw when it's magwell time......
Next, the Lt. Colonel's 1911 as previously written up here at LTW. Unfortunately the pictures were lost in the server switch. On this one I used one of Stan Chen's excellent magwells--
Coming up, a few older ones.......