I have ordered mil-surp parts from them before and they are always nice over the telephone and professional. If they send the wrong part there is no problem returning it.
If you are going to get that Czech Mauser and plan to leave it mil-spec and shoot it, then order a set of Swedish Mauser front sight blades ($10/3) so you can see what you're shooting at.
Most Mausers had short front sight blades so the trajectory of the 8mm round would stay within 12" over 300 yd. If you want to shoot to poa at 100m, replace the front sight blade with one of the 'square' blades for the Swedish Mauser (those blades fit any Mauser) and open up the rear "V" sight with s small Swiss file and you get a great sight picture. HTH. Mikey.