As Bruce explained, the SR-M110 (XM-110) is the US Army's replacement for the M21 and M24 rifles.
Quote:
The main differences between the Mk 11 Mod 0 and XM110 are:
· The rail system used: the KAC Free Floated RAS on the Mk 11 is replaced by a URX modular rail system.
· The buttstock: fixed, but the end pad is length adjustable for user's preference by using a tool.
· The addition of a flash hider to the barrel, which also necessitates a modified QD Suppressor unit.
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Guess where the extra ~2 inches (roughly the size of a flash hider) are going on the new model.