I'll put a reccomendation in for the M3 too. I've been playing for just over a year, and have used mine as a primary for about 80% of that time.
For CQB, it's my favourite weapon I've used, and deadly accurate within around 30ft.
For outdoors skirmishes, it's excellent as well, with about the range of a stock AEG, thougth you will find yourself outgunned by upgraded AEGs.
I don't recall, but if the M1100 is the one that you can load between 1 and 10 bbs into each shell and it fires a shell at a time (more realistically), then I wouldn't reccomend it unless you plan to have a shell bag on the side to keep from losing your shells. Even then, I don't believe it has good range for outdoors games at all, unless the field you'll be playing at has pretty tight cover.
Basically the M1100 is more like a shotgun; the M3 acts more like a bolt action carbine, the grouping is tight, and it's quite accurate, with a slower rate of fire (which is more practical for airsoft, but not as realistic).
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