The LDFA's plunger body has a shallow groove, or band, around its body, located near the plunger's concentric circular serrated face. The band serves to break up the outline of the LDFA plunger, for with the traditional rim removed, the plunger looks strangely long, the band only has cosmetic purposes.
The rimless design of the LDFA means the user's knuckle or fingernail will not snag on the forward assist while he uses his right hand to pull back on the ambidextrous charging handle's right latch.
The picture below shows the path of a user's fingernail, and scratches made by it whilst pulling back on a Mega Slide Lock ambidextrous charging handle by its right latch. The scratches were not staged.
We have kept the factory forward assist plunger's concentric circular serrations. Various angles, contours, and serrations were considered, but we didn't deem any to be as versatile and accommodating (while some use the palm,, some may use the thumb to press the forward assist, and the angles of approach will vary) as the round forward assist's concentric circular serrations, first seen on the M16A2.