While not designed to make a gun louder, a muzzle brake usually has that effect.
The Maxim suppressor was made of steel.
You have to make one
If you have the time and money, you'd need to make a suppressor from scratch, since the average Thompson was not able to fit a suppressor.
Suppressor
You need to be more specific as to what gun and what "accurate" is. However In general electric markers are more consistent that mechanical ones, which would make them more accurate.
Contrary to what you may have heard, or seen in a movie, there is no way to make an effective suppressor out of a soda bottle, beer can, baby bottle nipple, or a potato. A suppressor is a precision machined piece of metalwork that requires machine tools to make (like a lathe). To make one LEGALLY in the US requires filing paperwork with the BATFE to make a suppressor, and paying a substantial tax on it. Possession of an unregistered suppressor is a violation of Federal aw, punished by 10 years in a Federal prison.
To make the bullets more accurate by causing them to spin.
it depends on the gun, if its a shotgun then im not sure because ive never fired a rifled shotgun barrel. but with slugs in the shotgun yes it will make it much more accurate. and any traditional gun will be much more accurate with a rifled barrel. thats why muskets sucked lol
Have it checked by a good gunsmith
A shoulder stock permits a more steady aim, and generally improves accuracy.
Yes, in general a suppressor can increase rate of fire by 50-100 rounds/ minute.