I bought 3, 33 rd. g17 mags from Questar. They had been drilled in 4 places to find the correct place to apply a rivet to block capacity. They melted plastic and smeared it into the extra holes to cover the flaw.
This was 4 years ago. I never complained to them or on-line. If they will ship a product that is completely f%^&ed they don't deserve my business. There is absolutely no way this flaw was under the radar.
I never spent another penny on their site. I have had many friends ask where to spend their money including Military and Law Enforcement. I recommended other dealers.