Well, if you want a true-to-spec M4, select fire and all, you'll be paying a lot more for it than you would a shotgun, since you'd need a Class 3 tax stamped lower receiver or trigger group.
As for in general, between a shotgun and a civilian legal "M4gery", a lot of it depends. You can pay under $300 for a pump shotgun, but over $1000 for a semi auto shotgun. Generally speaking, the cheapest M4 clones on the market right now are CMMG's "bargain bin" rifles, which go for $500 (plus shipping and FFL receiving), and you can spend considerably more if you want one mil spec (or rather, as close to mil spec as possible) with the chrome lined barrel, 1 in 7 pitch, etc.
get the shotgun, but if you want a M4 get an electric on at evike.com or airsoft GI
I'm not much of a shotgun guy,I'm more of a gr15,m4 player,but on evike.com I noticed some nice shotguns,you might want to check them out
The m4 Sherman Tanker is more Russian because they most its parts.
You can purchase a Benelli M4 shotgun by going to the official Benelli Shotguns website and finding your closest dealer by simply just entering your zip code.
m4 <><><> You would have to define better. The M4 has a greater range, the AK a heavier bullet, the M4 a faster bullet, you can carry more ammo for an M4, the AK needs less maintenance, the M4 has a higher rate of fire- and so on.
50-200 USD or so
They are not the same. The M4A1 was first issued to U.S troops in 1997. It is more reliable than the M4 and has a fully automatic fire capability.
One would be able to find out more information about m4 airsoft guns online on Amazon. Two other sites that have some information about m4 airsoft guns are wikiHow and HobbyTron.
Well usually an M4 would be more accurate but it usually depends on who makes the gun. For Instance G&G (the gun that I own) puts tightbore barrels in all of there guns. But usually the m4 barrel is longer so more accuracy.
You can buy a plastic m4 or you can buy a metal m4
Nope
An M4 carbine would be better under almost all circumstances. It is lighter, more accurate at range (Assuming both have their stock sights), and more controllable in full auto mode. However, the AK47 is a cold war-era weapon while the M4A1 are much more modern. A more debatable and relevant question would be "Which is better, an M4 or an AK74?"