Get the 995. ATI doesnt make a stock for the 4095, and the ammo is quite a bit more expensive, and who really needs the extra power of a .40 over a 9mm in a carbine.
I picked up a 4095 at first because I thought the ATI stock would work and thats all they had in at the time, after I found out that the ATI wouldnt work, I ordered the 995. Now the 4095 pretty much just sits in my safe. It has about 150 rounds through it and is in perfect shape, Im thinking about trying to sell it.
I have both, and prefer the 4095. I found a good bulk deal on ammo for it and grabbed a thousand rounds for it and as long as I conserve it I will not have to worry about ammo price increases in the future