As the title says... Has there been a model with 5 inch barrel and fixed sights on .45ACP?

I love the match elites, but I'm not a fan of the adjustable sights. Can you replace them?

Yes, I had a match with fixed sights, all stainless SAO.

my old 220 match but rear sights was adjustable.

I saw a picture of one on this forum once a long time ago - P220, stainless frame, 5" slide assembly with fixed sights. Can't remember if it was a franken-gun or offered in that configuration from Sig.

I always thought if I could find one of those slide assemblies I'd love to match it up with my P220.

SIG did make some factory 5" Match P220s with fixed sights - looked just like the Match above but with a standard rear dovetail.

Looked just like the 10MM 5" with fixed sights, but this was before the P220 was even offered in 10MM from the factory.

They weren't that common and this was 5-7 years ago, at least.

OP, SIG in its perverse wisdom decided to put adjustable sights on almost all of it's .45 Match pistols, and those sights require a proprietary cut that won't accommodate any other sights. (I asked SIG why at one point; apparently SIG was fascinated with the fact that they called a good, general purpose 220 a "Match" model and were therefore adamant that it was a more-or-less dedicated target pistol.) At some point someone (as I recall, anyway) produced a fixed rear sight that would fit into the cut, but they didn't look very good to me and I'm not sure if they ever really hit the market or are available today.

The slides cut for fixed sights seem to have been made between 2005 and 2006, and came on pistols with both SA/DA and SAO lockwork. They occasionally show up on ChodeChoker, but tend to appear in flurries and then disappear for a while. If you can find a slide/barrel combo, it should slide right on to any 220 or 227 frame of that era or later but check your locking inserts to be sure. OTOH, the slide/barrel combo raaarely pops up on the market without being part of an existing pistol - if you decide you want one, your best bet is to look for a complete pistol.