Bought mine in March, 5xxx serial. FTEs after approx 300 rds, using a mix of Winchester white box 147gr, Blazer Brass 115gr, and American Eagle 115gr - all FMJ hardball. FTE every 3-5 rds, with both factory 15rd mags and 13 rd Meg-gar mags. Sent it back, returned with new extractor and extractor spring. 1st trip after repair, 100 rds of same mix, no issues. 2nd trip, at about 250 rds, same issue. FTE every few rounds. Another RMA, sent back, waiting for the response. This is my 2nd Springfield, my RO Elite 10mm has been flawless for at least 1000 rounds. Was hoping to introduce the SA35 into the EDC rotation, but not now! Suggested that they replace the unit, we'll see what they do.