Bought 2 of these a few months ago and tried them for the first time a couple days ago. They are tight going into the magazine well and won’t feed rounds to chamber. I compared this mag to my factory mag, see photo, and noticed the back of the mag that fits in the groove on the mag well is slightly wider than my factory one and the top of the factory mag at the feed is has straight level feed angle verses this product that has a higher lip at top that snags the round on feed and prevents clambering. The top of these mags need to be ground down to get rid of the lip and make the right smooth level angle so the rounds don’t snag on feeding.