I put another 100 rounds through the Solo STS today making a total of about 300 and happy to say no FTE or FTFs. Shot 135g Federal, 124g Hornady, and 124g Remington as recommended. The Federals seem to be best though all were accurate. I'm starting to really like this gun. Very accurate - making one large hole from 3 shoots fired it was that close together and I'm just a novice. Actually used a fingerless glove which helped a lot with racking the slide. The only thing was with the Remingtons the slide would not stay open after final shot. What is this telling me? I know I caught the little spring when reassembling it.