6 inch barrels seem to have fallen out of popularity. There was once a craze for long barreled hand guns, 8 3/8 was king then, now it is going toward concealed carry. The longer barreled guns are more accurate and better for longer range sessions due to barrel weight helping absorb the recoil. Try to find both and see which one feels better to YOU. Also check out the md 686 and maybe even a Ruger GP-100. Just guessing but those two might be easier to find than the md 66 in a 6 inch version.