probably too late now, but the new m40a3 has been chambered for the 6.7 Lappua round, not the .308 winchester. looks good though. you should make a rifle bag to go with it, like in jarhead. just use the vanilla rifle holstering animations, just make an new backpack model. Probably still needs a bipod and a thing to hold rounds on the stock.
your thinking Army M24 long action. The chamber is enlarged to fit full length cartridges like the Springfield 30/06 and other biggies, including the .338 Lappua (we don't use metric when referring to Lappua rounds, its tradition so dont monkey with it)
Us "Jarheads" (know why we're called that? Kudos if you do) utilize the short action rifle that is good for 7.62NATO (here we use metric) and .308 Winchester (again, no metric ever won the west)
Not too late really. However http://en.wikipedia.org/wiki/M40A3 says it's chambered in 7.62x51 (.308) so I'm just going to stick with that.
HOO-Rah!!
btw, your avatar reminds me of a DI I use to hate
Andy
Acolyte think Zealotees avatar reminds him of one of his dates lasts week :yuck: