Tier 1: This bundle starts you off with the essentials to get you going and keep you safe. Tier 2: This adds necessary items such as a sling, carry case and extra mag to get you out in the field at your local skirmish site. Tier 3: Contains extra bits and pieces such as a dot sight and target so you can practice at home and hone in your skills.Zero One Airsoft,Airsoft,Air Soft,Dorset,Hampshire,softair,,01,Airsoft,Ar-15,Ar15,Automatic,Bb Gun,Beginner,Combat Machine,Electric,Gun,M4,One,Pellet,Rifle,Softair,Upgraded,Value,Zero,Zero One,Zeroone,Zoa,,ZO,AEG,CM16,Raider,Starter,Pack,Tier,1,Bundle