I'm going to get a Burris Fastfire III Red Dot Sight 8 MOA Dot with Picatinny Mount Matte Black for my husband. I won't be able kick around the pros and cons of this particular sight as I don't know much about them, only that he mentioned some time ago that he liked this one.
I'm sure he will want to use it on his AR15, and I see that this sight comes with a Picatinny mount, so it should fit. However, I was surfing around reading some reviews, and noticed that some guy had purchased one but also got this Weaver Offset Rail Adapter to mount his new Burris to his AR15.
So my question is ... why would he have needed that? Is it just something that you can quickly move from gun to gun, say, is it easier to detach it from the AR15 so he can use it on a pistol or something? Is there some advantage in using this adapter? I know there are Picatinny mounts and Weaver mounts, and most Weavers will fit Picatinny, but why is this mount necessary. Gee, all was going good until I saw this review and then started to wonder if I was missing a part.
Thanks for any help.