I use both, flat on most of my 1911's but oddly enough i have an arched checkerd one on my SA Defneder I use in 3 gun, and really like the way it feels although I don;t find any diffeence in accuracy with me between the two. I think arched looks cooler....if that means anything to anyone else but me!
The arched housing was added because many soldiers were hitting low. I found the same thing, so I added an arched the same time I dropped the full-length guide rod in my Kimber.
While I love the look/feel of the FMSH, the bottom of that puppy hits me in the heel of my hand and digs in, like a shovel.
So, on my Gold Cup, I put an AMSH from Pachmayr.
Arched and long trigger. Perfect for my 'ham hands'!
My Colt came with a flat MSH, and the first few times shooting it I didn't have a problem with hammer bite (it does not have a beavertail on it).
I liked the way the arched MSH felt, so put one on. The first time at the range with it, I was bit by the hammer. Not sure if that was a one-time only thing, or if it will be repeated in the future.
My Gold Cup (above) is a 1984 model. I put the Commander hammer and beavertail GS on it, after discovering that the sear had one 'leg' chipped on it, a couple of years ago.
I put the grip safety, sear and hammer in it, and no more hammer bite!!!!
Flat mainspring housing on a 1911 don't look right, sorta like wearing a pair of sneakers with a business suit, yeah they are comfortable and sensible, but the don't look right! Classic lines are not to be messed with. Sort of like taking a Jack O'Connor classic 270 Mauser or Mod 70 and changing the angles and dangles of the stock, Mick.
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