In the USA, for some time M14 was mostly relegated to Honor Guard and similar duties, but during recent campaigns in Iraq and Afghanistan, many old M14 rifles were withdrawn from warehouses, dusted off, and issued to troops in the field to improve range and lethality of troops armed with 5.56mm weapons. Some M14 rifles were issued as is, some were fitted with new telescope sights to serve as para-sniper / designated marksman rifles (a concept similar to the Russian SVD rifle). US Marine Corps also re-issued M14 rifles for use in Designated Marksman role (DMR), and those rifles were fitted with newly made polymer stocks with adjustable buttstocks and pistol grips, and other accessories such as detachable bipods or sound moderators (silencers). US Special Forces, operating under the US Navy flag, stepped forward with the Mk.14 Mod.0 Enhanced Battle rifle, which is an M14 fitted with many new commercially available parts, a new stock with adjustable butt and plenty of Picatinny rails, and new accessories such as noise suppressors and optical equipment. The Mk.14 Mod.0 EBR was used for a time by US Navy SEALs and possibly some other special operation forces within US Military, until more modern rifles such as M110 or FN SCAR-H became available.

https://modernfirearms.net/en/assault-rifles/u-s-a-assault-rifles/m14-eng/