ButcherBill

I've only used the RA-TECH WE Open Bolt NPAS Kit for my Scar & an XM177, there may be better ones others would recommend.

Had 2 of those... great bikes but weigh a tonne

Yeah, take it to the range and fire off a load of bb's before you crono, my guns rarely get used so the springs are pretty tight for at least a hicap mag worth, for GBBR's you can fit an Npas so you can adjust the gas flowing forward or back.

Try down the side of the couch

Did it thread straight into the plastic or a metal insert?

try 10p coins as a spacer first

I finally decided to go down the modelling route, hands currently dotted with Revell enamel paint.

Much better

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?