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I was think of buying a sub 2000 rifle in 40 cal takes Glock mags it's a gen 2 for $425 brand new.
I had a subbie in 9mm. When I got the beretta cx4 in 9mm there was no comparison. I traded off the subbie and never looked back. The make a cx4 in .40 too.
I found the straight stock and height of the sights on the sub2k made it kind of uncomfortable to shoot, you had to get your face really low down and close to the bore. It was fun for a little while but I sold it eventually.