Might not shop here again, awful CS, polite but awful.
I bought a battery for my CM041 on their say so that it would fit; even with my body weight on the the gun, the battery was 1-2mm too long to engage the top stock to body pin.
I returned the battery on the basis that I only bought it after an email exchange with them specifically to ask if it would fit, and they said that it did.
It took me 25 emails back and forth from me informing them it did not fit, plus photos*, to their taking it back. And now they're telling me it fits in their CM041 like that means something to me, it did not fit in the CM041 which they sold to me.
Obviously I tried all 2 different rotated positions to fit the battery.
It has taken a massively disproportionate amount of time to convince them to take the battery back and while they are processing the refund, they're not at this point willing to refund/storecredit the £5 postage it took to return it.
*it was reasonable for them to ask for photos, but there was no way to show in a photo that the battery did not fit.
I will revise this if they re-evaluate their position.