Looking to build a Rem 700 SA in 223 with either the Mcrees or the XLR. Both have their good and bad points but those who have used either, which would you prefer and why? The Mcrees is a little less for the folder. Both take the AICS 223 mags, I believe. Why a 233, because my range is only 500yds and it is a lot less expensive to shoot. Is the metal chassis a problem in hot and cold weather? Thanks for the input.