Their AR-15s tend to range from $1200 - $2000. IMO, you can build yourself a better rifle for that amount.
Depends on your budget, and if you want an entry level rifle or a tactical rifle. That makes a HUGE DIFFERENCE!!!! If you want a basic rifle, the CMMG Bargain Bin is well worth it. If you intend to impress others with your mall ninja abilities, then Colt, Noveske, or LMT is practically mandatory.
Noveske, LMT, Colt, Armalite and Daniel Defense are the are very reliable assault even when you put them through almost anything.
The 22pump rifle made by premier how much is it worth
That depends on the exact model of rifle.
Depended on the rifle. $5-$500
Noveske, LMT, Colt, Armalite and Daniel Defense are the top 5 things to put on an AR.
Commando Rifle is much better.
Depends on exactly which rifle(s) you refer to.
How much do you want to spend? DPMS, CMMG, Double Star, Colt, Les Bauer, POF, Bushmaster, LMT, Noveske... all make AR-15s in different price ranges. All do what they're supposed to.
If you're using it for a leisure plinking/range rifle, you'll probably never see the difference in service life. If it's a rifle you'd be using operationally, or firing on full auto, and displacing high quantities of ammunition, then you would. Daniels Defense is a great company which makes high quality products. I'm really surprised to see that they would have a barrel for only $250, especially as their products tend to be priced more towards the high end. I suppose it would really come down to what you're building your rifle for. If it's going to be a service rifle which sees a lot of use, you'd want the chrome lining. If not, there'll be no benefit to it, and it'll actually impede your accuracy (which is why rifles manufactured for high precision don't use chrome lining in the bore). Noveske is a quality manufacturer, but their products also get marked up a lot because of the name. For a chrome/moly barrel, you could do just as good for considerably less.
how much is the carcano rifle worth
That depends on the exact make and model of the rifle.