I own an Ultra Carry ll in .45 with the Crimson Trace laser grips. About 50 / 50 whether I carry it IWB or OWB. Carries well for me both ways. Maybe 600 rounds thru it now, not one failure to function properly. Very nice trigger, and an accurate gun.
Many of the reliability issues with these short barrel 1911's can be traced to a few areas. Recoil springs - It would seem dual, captured springs seem to work better than a traditional single spring set up. Magazine springs - A strong mag spring can make a major difference for the better. Because of the shorter cycle time time on these shorty 1911's, a weak mag spring may not present the next round in time to cycle properly. 3 - reliability can be increased by experimenting with bullet weight and velocity, with ammo giving slower slide speeds often being more reliable.
These are all issues short 1911's experience because of quicker, shorter action timing as compared to full size guns. Then there is the usual issues that all semi-autos are subject to, like rough feed ramps, poor magazine fit, ect.
Wanted to also add that a lot of feeding issues with the 1911's can be traced back to their extractors being to tight. 1911's feed by the slide coming forward, picking up the next round, with the rim of the cartridge sliding up under the extractor similar to the way a Mauser controlled feed rifle works. The extractor does not snap over the cartridge rim like many think. If the extractor is on the tight side, it causes a partial feed, with often a nudge of the slide needed to complete the cycle. The cure, adjusting the extractors tension, is easy, with several good videos on U-Tube.
Larry
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Larry, on Flickr