I was really wanting to buy an LWRC m6a2 or a3 and purchase an 6.5 upper later on if i could. i know lwrc makes an 6.8 which is an good round to, but i think the 6.5 is better for hunting. is it possible to put an piston 6.5 upper from a different manufacture on an LWRC lower. Im also having trouble finding an manufacture making 6.5 for an ar. if there is any other quality piston ar's that offer 6.5 I might would consider them too for a complete rifle with the 223 then purchasing the 6.5 upper from that company. dont know if any would even be as good as LWRC from what i have read an herd. thanks for the help.