Prime LR300 misfire

[ferretmaster]

Hello all. I'm after a bit of techie advice from those with much more insight than I. I have a Prime LR300 just serviced Oct 10 with a new spring, hop unit and bushings of some sort. The Zero-One techie also did something to the trigger-pull, as I used to have an issue with multiple shots on semi-auto. Not sure speciifcally what he did though.
I haven't able to skirmish until this Sunday past, and discovered that it's seriously mis-firing. On semi-auto, it fires one BB for every two pulls of the trigger. So basically it shoots a bb, dry-fires, shoots, dry-fires and so on. It's also misfiring on full auto, and I'm guessing the same way.
I've adjusted the hop to off, and then slowly on - no joy. I've tried different mags (always lo-caps), wiggling, pushing them etc in the magwell and still no joy. It's a custom 5 x 2000 cell battery which is probably due for replacement by now but I'm not sure that is relevant. Any ideas please? Thanks in advance!

[Gaffa]

Re: Prime LR300 misfire

Try some different make ammo, report back.

[ferretmaster]

Re: Prime LR300 misfire

Good shout - thanks. I'm using the Zero One branded stuff at the mo.
I also took the top receiver pin out and reseated the metal hop unit, as well as re-seating the battery/motor wire which was protruding slightly into the magwell. It *seems* to have done the trick, but I have only been able to test very briefly due to a yelling wife and no garden...

[ferretmaster]

Re: Prime LR300 misfire

Just an update on this - turned out that it was my 8 year old magazines that I've been using and abusing. Lazy-boy here has kept them loaded when stored (groan, I know) and the springs have had it. Bought a new mag and it works a treat with zero misfires. So time to stock up on new lo-caps!