Best left to a trained armorer
Best left to a trained professional
Best left to a gunsmith or SIG trained armorer
Glock 17 and 19 They actually use Sig-Sauer P228's.
50-500 usd
50-400 usd
smith and Wesson (smith & Wesson) and Sig-Sauer
Impossible to answer without more information.
Sig Sauer, Sturm Ruger are a couple of manufacturers.
10 rounds
100-300 USD
50-500 usd
The M11 is the Sig Sauer P228, for which a 13 round magazine is standard. It can also accept 15 or 20 round magazines common to the Sig Sauer P226.