KAC M4 RAS and KAC M4 RIS

[parishioner]

Whats the difference? They are the same price. They look the same.

I noticed there was two similar ones on KAC's website. The only difference I could see was the weight. One was about an ounce heavier.

Their site is down but you can see them here.....http://www.mstn.biz/index.php?option=com_joomla_store&jStore=index&Itemid=27&manufacturers_id=6&jStoreid=76f67a06a8f5fb91af3a126e3e07992

[jasonb]

This explains it far better than I can:
http://www.quarterbore.com/kac/kacrisras.html

[parishioner]

Holy crap. That explained everything. Thank You.