Re: Threading barrel with sweated front sight
Zoeper, If you're careful, and quick, you're unlikely to affect the temper of the barrel, but because of the small diameter, the slight risk of distorting the critical muzzle area, and the difficulty of refinishing the area that is soldered, I also recommend parting off just behind the sight, threading and recrowning the barrel. With lighter bullets, 35-45gr, velocity loss won't be any more than A.J. stated, and you will have a more compact rifle in the bargain, with or without the silencer.
If you decide to remove the sight, drift the blade out and look for a set screw under the dovetail that goes down to index the barrel and hold it in position for the soldering operation. Some sweated-on bases have this small set screw in them for that purpose. If it's there, the barrel will have a shallow, drill-pointed hole in it also.
Don't run afoul of the law with the silencer.
Good luck, Tom
Texas State Rifle Association Life Member
NRA Endowment Life Member
A big fast bullet will beat a little fast bullet every time