ButcherBill

Try shimming the inside of the magwell, it's common to use the fuzzy side of velcro

I've bought several items valued between £5 -£300 from the classifieds here & the only issue I had was on a low vaue item (about £10-20), the seller refunded me with no issues & I offered to pay again if it eventually showed up. You pay your money & take your chances. TBH I've had more issues with deliveries from retailers.

Wash your mouth out with soap.

Is it possible to trim it?

Given how many pews you've opened up recently don't you have a nozzle(hopefully longer) knocking about you can try?