RSAF Enfield had one last trial rifle, the EM-2. The intent was to develop a new self loading rifle (SLR) that was chambered to fire a rimless .280 round (7x43mm) However it was not to be. When NATO, at the Americans insistence, adopted the 7.62x51mm (.308) round, a shortened and improved 30-06. The EM2 was not redesigned, and the FN SLR was adopted, oddly enough the prototype of the FN was also chambered for .280 British round.

The Americans after a series of trials adopted the M14 rifle over the FN, which was shortly there after replaced by the M16 family of rifles chambered in 5.56x45mm. the M14's were not well suited to jungle warfare in Vietnam. M14's equipted with scopes are being issued again to squad marksmen in places like Iraq where the longer range and hitting power of the 7.62x51 can be employed.