Burp is the hammer bouncing on the valve stem, a quick burp there is enough bounce to have air reset the hammer when the seer is able to catch it, if you can fire again.
Either make the seer able to move faster in design, or a strong seer spring.
Magnets are also cool.
I like Spyders.
MR1, MR2 LP, EMR5 LP, EM-1, Raven Primal, Victor, Fenix.
Magfed Hurricane with T15 Mags