Judith Fisher at MetalTalk.net described the single, entitled Ready 4 U, as a "chunky slice of hard hitting, foot stomping rock, filled to the brim with chunky guitar riffs and melodies [and] driven along by pounding drums that is guaranteed to get fists pumping and heads shaking". And she knows here stuff.
The last WEAPON single, released in 1980, actually got namechecked in a book about Metallica, which is pretty cool. Here's the extract:
'Metallica opened its early live sets (and “Kill ‘Em All” album) with “Hit The Lights” a song that begins with a noisy two chord flourish meant to evoke the opening of a concert. However, in a further illustration of NWOBHM’s important role in Metallica’s musical direction, the opening chords – drum fills and all, seem to have been lifted directly from WEAPON’s “Set the Stage Alight” - the 1980 release from the influential fledgling NWOBHM band' (Metallica Biography Damage Incorporated Pub. 2006)
You can download Ready 4 U on iTunes here.