I've read a lot about the Winchester Model 1400 MKII 12 ga, 2 3/4 chamber and most don't like this shotgun at all. The one I inherited hasn't been fired in over 25 years so I'm going to have it looked over before firing. Have any of you had any experience with this shotgun? Pro's or con's or what to watch out for? The serial begins with "N" and I've read they were only produced from the late 60's to early 70's.