Have LEGO gunners beaten us?
The Thriller Automatic LEGO crossbow pistol. ( Interesting mech.)
Bolt action LEGO crossbow. ( Based off of Thriller auto.)
LEGO Mini Pump Action Shotgun. ( Never seen this with K'NEX.)
LEGO Pump Action Shotgun. ( Some problems, but still.)
LEGO Sniper Rifle. ( Shoots MORE than 25 feet, DJ.)
There's LOTS more, but i picked out ones i first came across.
IMPORTANT NOTE: LEGO has more variety of pieces, so maybe that explains the innovation.