We did a video last year on a USPSA budget rig, so i thought i'd bring the links over here, too. The rig is definitely competitive, I run it and am always top half of the field, usually top 1/4. Last match i placed 3rd in CO, 10th overall. So despite this stuff being budget minded, it definitely will do the job. check out the video linked below, and the affiliate links below that.
Mag Holster: https://amzn.to/2GEyG8E
Holsters: Harder to find for the SP01, but here's the link to the general amazon, just gotta keep an eye out for SP01 version. https://amzn.to/2qbIN9P