Oh for sure,killzone isnt as far ahead as halo is,thats why it makes sense for its weapons tobe rigid and less streamlined,halos weapons in1-3 made sense because they all were very smooth and basic looking,which is logical because you want less spaces and smoother exteriors for your weapons(less ares for things to get into,or caught on things)
Heres the classic m16(decked out with scope) http://www.defensereview.com/stories/m16clinic/M16%20Viper%20with%20the%20Coyote%20Ugly%20Finish,%20by%20M16%20Clinic.jpgNow this is the glorious new Xm8
http://www.murdoconline.net/pics/xm8c.jpg
As you can see the xm8 looks alot smoother and much more streamlined. Having the new BR be more like real guns makes very little sense to me =\