Some of the differences off the top of my head. Bearing in mind we don't shoot USPSA here.
in IPSC we are only allowed to walk through once the briefing has been given. Then there is normally a five minute walk through. We may not set foot on the stage before this.
Gear wise
IPSC production is a bit stricter. No refinishing or aftermarket parts aside from sights and grips. 5" barrel length max. 15 shot capacity limit. 5lb trigger pull requirement for the first shot fired. We can use race rigs and magnets in production.
Standard guns (similar to limited) must fit the box.
This is is outside my experience but based on what Ben Stoeger has described IPSC is a little less hoser than USPSA. Harder shots. Etc.
No humanoid targets anymore. Only amoebas and steel.
Welcome to Africa, bring a hardhat.
Almost forget aside from Open gear must be behind the front of the hip bone. So no AIWB.
Welcome to Africa, bring a hardhat.
In IPCS, moving outside of the fault lines during the course of fire is a procedural penalty. In USPSA, you only get a procedural penalty if you fire a shot while outside.
In other words, in USPSA you can take movement shortcuts through a stage. In IPSC, you can't.
On the Enos forums, a thread about this was started up, and one individual made a sharable document about the differences.
http://www.brianenos.com/forums/inde...9#entry1941826
http://www.scribd.com/doc/144970593/...PSC-Rule-Books