I have an OLY Glock 9mm. I use the "factory" Glock 30 rounders. No problems what so ever. I only load 28. I have 2000 rounds through it now. I use +P+ federal. Very hot round. It works for me. You might have read my thread already. If not, its a good rifle. As with any rifle from any company you might hear other people complain about their 1 in a hundred lemon they got. So dont let all the hype deter you from going with OLY or RRA or whoever. I have a flat top with 5.5 supp.. I have an Eotech with LMT A2 rear sight. Switched the grip out and I got an "ezsling" from ezsling.com. No rails, i like it simple. I'm gonna get a light package soon but still researching. The only thing that sucks is the stock. Pure junk, it will work better with a butt pad but I'm gonna switch it out for something else more durable in the future. I never had a 9mm rifle and was impressed at the acuracy at 100 yards in the standing and kneeling positions. If you have any other specific Q's let me know. Mags are cheap and plenty of them; if you own a 9mm glock even better. OLY has lifetime warranty but the customer service is a little rough. If you have a problem they will fix it but patients is a must I hear. I personally think they are overwhelmed with orders and have vendor delays frequently for parts, so I would check your local shops,www, or gun shows so your not waiting and pulling your hair out. I hear Atlantic Arms has a good deal. Good luck.