Go some where reputable and recommended. Also know how long its going to be, mine was subcontracted to an engineering firm who did a great job but I found I was waiting for them to fit it in, and missed the buck season. Re proofing is not absolutely necessary unless you want to resell the gun as I understand it, I had mine done as a then new rifle shooter thought I might be trading up, which I have not as it happens. you will need a variation for a mod unless you already have a slot on your fac Tom