My groupings aren't all that bad. Granted my left arm support hand is numb most of the time and sometimes my trigger finger due to health issues...but here is my dilemma. The first picture is my grouping of 10 rds Rem. UMC 115 gr. FMJ. its on the colored target. The target itself is the size of a compact disc. The second is my Dad's grouping of 10 rds of the same. He's the guy that taught me how to shoot a pistol. I don't get it. Both of us shoot left of center...his is worse however b/c he's only shot my Glock twice now. what's the deal? can you adjust glock factory sights? believe me there 's no flinching being done.