(Photo courtesy: Thefirearmblog.com 2017)
Original post : http://www.thefirearmblog.com/blog/2017/02/08/hk-mp5-sef-mean/
Many people have wondered, there's the typical H&K receiver with marking of bullet crossed out, one bullet and six bullets, and there's S/E/F on the older ones, but what do they mean? The Firearm Blog provides us with a great answer to what S/E/F means. Thumbs up!