BudsGunShop.com - SA/DA or LEM?

Per the manufacturer's product manual, the V3 is the Double Action/Single Action Variant 3. Please see page 7 of the product manual in the link provided below.
http://hkusa.s3.amazonaws.com/20140509153029/P-Series-Operators-Manual-05302013.pdf

The HK Law Enforcement Modification trigger system combines the advantages of a cocked striker component (constant level of trigger pull from first to last round fired) with a double-action hammer system.
Developed especially for a U.S. government agency, the Law Enforcement Modification (or LEM for short), is a unique trigger mechanism created specifically to improve the trigger performance and reduce the weight of the Double-Action Only (DAO) trigger pull on HK pistols