The remington 870 is the most iconic and origional one used for a masterkey.
get the shotgun, but if you want a M4 get an electric on at evike.com or airsoft GI
unless it wont shoot than no
Neither, all guns are violent and dangerous.
Definitely get a rifle. It's much more accurate and penetrable. Kinda obvious.
Get the pistol, preferably a 1911, you get better velocity, and a smaller easier to carry pistol.
Type recommended by the maker of the airsoft.
An Airsoft gun
Yes, any airsoft weapon should be lubricated properly.
Airsoftmegastore.com
Myself, As a Fellow Airsofter have had situations like this. I would Reccommend you put your bet on the Shotgun. You will have money on the side to save up and maybe one day purchace the ak. Believe me that is the best choice. :)
there will be a sling attachment at the end of the gun put your sling on that and there will be a sling attachment on the back of your gun hook it to that there your sling is attached.
Any airsoft supplier should carry these items. A quick search for 'airsoft suppliers' via a search engine should find these for you. You may also find them at retail chains which sell airsoft products, such as Wal Mart.