Design
The rifle is similar to the SR-25/Mk 11 Mod 0, but differs significantly in buttstock and rail system design. The SR-25, Mk 11 Mod 0, and M110 are based loosely on the original AR-10 developed by Eugene Stoner but feature additional refinements instituted by KAC to maximize parts commonality with the AR-15 design, improve weapon reliability, and increase accuracy.
The main differences between the Mk 11 and M110 are improvements suggested by a user group meeting between NAVSPECWAR, USASOC and USA in 2007:
- The rail system used: the KAC Free Floated RAS on the Mk 11 is replaced by a URX modular rail system with integral folding front 600-meter back-up iron sight.
- The M110 buttstock: fixed, though the buttplate is adjustable for length of pull to match user preferences. Adjustment can be made without tools via a notched hand-tightened knob on the right-hand side of the stock. This feature was added during the change from XM110 to M110. The fixed buttstock also features integral quick-detachable sling swivel sockets located on each side of the stock near the rear of the lower receiver.
- The addition of a flash hider to the barrel of the M110, which also necessitates a modified QD Suppressor unit similar to that on the Mk 11.
- The M110's use of KAC's one-piece 30 mm scope mount instead of two separate scope rings.
Other changes were made when the XM110 made the transition to the M110. Features added were a buttstock hand-tightening knob, sling swivel sockets, a double sided bolt catch, and a button on the folding front sight to allow it to be locked into position.
On June 12, 2008, the M110 was ranked #2 on the U.S. Army's top ten inventions of 2007.
According to performance specification (MIL-PRF-32316 (AR) w/AMENDMENT 1, 5 October 2009):
3.4.1.1.1 Accuracy. The distance between the mean point of impact of each shot group, both unsuppressed and suppressed, shall be not greater than 1.1 inches at 300 feet.
3.4.1.1.2 Dispersion. The average mean radius (AMR) (see 6.11), of each shot group shall be not greater than to 0.68 inches at 300 feet. All targets shall be fired on using M118LR ammunition or equivalent, using five (5) round groups.
AMR 0.68 inches for five-round groups corresponds to 2.34 inches extreme spread for 10-round groups or 2.2 MOA extreme spread for 10-round groups 300 feet.
Read more about this topic: M110 Semi-Automatic Sniper System
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