I'm interested in this, as well.
Those are well-made pistols, but my experience with 1911s is 4" bbl and up.
Someone musta figgered something out, because the market now is polluted with 3" 1911s.
One of the things that prevented me from getting one back in the day was the reported poor reliability.
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I had a similar experience with poor reliability in a Colt Officers model about 20 years ago and I came across one the ther day in a local gun shop. It was a long, long way from smooth when manually functioned. It has issues.
Kimber however did get it right with their Ultra carry. I carried one for nearly a decade and shot it at least once a week 50 rounds per session. Even conservatively reducing that to 40 weeks a year that’s 2K per year and 20K total.
After an initial break in of around 500 rounds it was incredibly reliable not just with FMJ but also 185 and 230 gr Golden sabers as well as 185 and 230 gr XTPs. It was also surprisingly accurate. I still own it but it’s semi retired as it’s alloy frame is likely getting close to the end off it’s fatigue life.
One observation I have made with commander and officer frame sized 1911s is there’s no room to mess around with them.
With a full lemgthn1911 there is plenty of slide over run so you’ve foot room for unnecessary items like shock buffers and you have a lot more latitude to install lighter or heavier recoil springs.
On a commander sized frame that slide over run decreases to around 1/4” and you have a lot less margin to play with before you start creating reliability issues.
On an officer sized frame you have no margin at all. Everything is very precisely engineered so don’t mess with it,
Recoil spring life is also critical and on my ultra carry it had an 800 round spring life, so basically 3 new recoil spring assemblies per year.
I also didn’t mess around with magazines but stayed with the stock Kimber mags. Feed lips on a 1911 magazine are an integral part of the design of the feed system and are also point shape dependent. Kimber uses a “hybrid” or “Colt commerical” feed lip design and it works well with most FMJ, round nose, and hollow points. Semi wad cutters can be problematic depending on length and point shape.
Other companies have also gotten it right. I carried an officer model sized Citadel in 9mm for a couple years and it was also extremely reliable. It’s probably the best bang for the buck in a 1911 I have ever encountered.
The Star BM isn’t exactly a 1911 or quite officer model sized but it’s a right sized 9mm 1911 esque pistol that has also proven to be very reliable.