W W Greener Shows pictures of an electric ignited shotgun in "The gun & Its Development". This one use a battery & vibrator coil. He didn't speak very highly of it (Perhaps because it was someone else's invention) & found the "Buzzing" of the coil objectionable. Later electric guns I have seen info on did not use the coil. With the electric system there are a lot less moving parts & those present are not critical. The trigger has only to close a circuit.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra