Anyone that can suggest specs on the feed lips for a Pro Mag 4595 magazine? I have a new one that will not feed ammo, I get nose up jams. As it came from the pkg. , I could not get two shots in a row . It was shoot one , clear jam , shoot another & clear jam. Out of two mag fills (28 rds.) I got a second shot one time without a jam. On a whim , I turned the mag spring backwards and it did work a little better but not by much. I see 3 places to measure the feed lips. Rear of mag. Front of rolled feed lips forward tabs Willing to listen to any suggestions !!!!!!!