[bitsandkits]

Ok

space marine pointing arm is left
grenade arm is right

here are the standard marine arms
http://www.bitsandkits.co.uk/space-marines-space-marine-pads-arms-c-6_20_649.html

sanginary guard have closed and open hands
http://www.bitsandkits.co.uk/blood-angels-sanguinary-guard-bits-c-6_636_638.html

some of the chaos marin arms are quite good for pointing conversions such as the right handed bolt pistols
http://www.bitsandkits.co.uk/chaos-space-marines-chaos-marine-weapons-c-6_56_85.html

if you need any more just contact me