I have a standard model DA/SA 9mm 239 that has suddenly become inaccurate -- primarily east-west. I've bragged about this guns accuracy on this forum in the past. I shot it in USPSA for a while and had zero problems.
I haven't shot the gun for a few months, took it to the range and could not get a 7yd group less than 4+/-" (right and left), up and down was still fairly tight. No two shots ever hit close right and left.
Yes, I made sure my grip and trigger pull were correct. Happened in DA and SA. Shot two other guns the same day and had no problem getting 2" groups (or better)with one flyer. My son tried the gun and had the same loose groups left and right.
Info: 4-5K rounds through it
Shooting sub-sonic 124 gr FMJ before and after problem appeared
No change in ammo, distance (7-10yds), or shooter (except older).
After about 1500 rds the slide was really loose--will rattle when shaken
Never a squib or any sign the barrel is in trouble--it won't move around
when in the lugs
Std "dot the I" sights aren't loose
I keep it clean and properly lubed
I just didn't know where to go from here. Nothing obvious seems wrong, it just scatters right and left.
I'd sure appreciate any ideas/experiences you shooters might have.