I bought on of the slip on ones and it was too tight even with baby powder it wouldnt slip on. i said it didnt fit and i told him i have a five seven, he said well if it fits a glock....,i laughed and pulled out an empty mag from my pocket....returned no problem
I put a Hogue Handall Universal Grip Sleeve on my 5-7 IOM and am pleased with the feel of it. I used a hair dryer to warm things up a bit, as per directions, and with a lot of tugging and pulling got it on. At first I had my doubts about getting it on but you just have to persist and not give up.