Airsoft technology self paced training guides

[Craigmc1983]

Hello guys,

So on Amazon kindle they have these guides, they are free on kindle unlimited (which I have) so thought I'd ask if any of you have ever read them?

Also does anyone know where else you can find them? (Ideally for free) 

There are loads of them about different guns but the one I actually want to read (bullpup v3/aug) isn't included with kindle unlimited and I don't wanna pay £7.50 if it's not that good