I ordered a Howa 1500 20" #6 taper barrel in .308 and had some questions on upgrades. I'd like to install a Timney trigger and they ask you to select a pull weight. Does that mean it comes pre-adjusted from Timney to that weight as the description says it's adjustable? I'd also like to order the HS Precision PVS140 stock to replace the Hogue stock. Lastly where is the best place to have the barrel threaded?