As I understand it, the Colt SP901 comes with a 20 inch barrel. The Colt LE901 comes with either a 16.1 inch barrel or a 13 inch barrel. I have not seen a SP model but I do own a the LE 16 inch model. No mention is made in the owner's manual of the LE model being able to accept 5.56 uppers, The Colt uses 20 round pmags, which can be had for around $20. The SCAR magazines I have seen are going for around $90-$100 each.
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