I bot new mag, and installed brand new recoil springs. Took it to the range, fired 6 full mags of 8 rds. One round hung up ( the first round in the mag ) when I released the slide using the slide release on a full mag. All the other rounds went in fine after "slingshoting" the slide with the full mag. Ramp is very coarse. Is the problem more likely the chamber or ramp in need of polishing? Thanks in advance.