A quick follow up on my earlier post where I was getting +50fps over spring rating with a bunch of Laylax internals, firefly hop and prommy 603. Refitted with the original spring before a skirmish, getting consistent 340fps. Put around 2000 rounds through it over the course of the day, left it for a couple more weeks, still shooting 340fps consistently! Bit odd but can't complain. Getting just shy of 14 rps at the same time (on 8.4v NiMH). Hopefully it'll be shooting a bit more accurately now it's had a chance to bed in, rounds were going all over the place at the start of the day.