A local gunsmith did the loading port work. It's opened ever so slightly.
I installed most of the aftermarket parts (CC mag tube, IWC mount, GG&G bolt release, Scalarworks mount, OEM Benelii night sights, Noveske QD Mount etc).
Anything that required tightening was done with a Whia torque driver to the manufacturer specs if available. If no spec was available torque was done with in tolerance of the fastener size for consistency and to eliminate over tightening. Blue loctite was used on all fasteners except for the Noveske mount, red was used there. I'm really meticulous when it comes to that stuff. The CC 7 round mag tube with installed with blue loctite 243.