I think the biggest problem you'll find converting to 458 or any other caliber is finding an appropriate barrel. How many AR barrels have you seen without a gas port? You would probably end up having to have one built. Unless of course the PAR uses the AR gas block saddle as a mounting point for the forend or something like that.
I don't own one but have been tempted many times and if someone can shed some light on how to use a regular AR barrel that has a gas port drilled that would be great.
I don't own one but have been tempted many times and if someone can shed some light on how to use a regular AR barrel that has a gas port drilled that would be great.