I think the Bushmaster is probably the better beginners choice for the following reasons
A) the company has everything for the shooter, meaning you do not have to rely on other parties to get exactly what you want.
Note: The most popular choice- regardless of maker- is the carbine (short barreled rifle, usually 16") and overwhelmingly in a flat-top configuration or A3. This is based on giving you open-ended options for later. ie optics, etc.
B) Bushmaster has very good customer service. The others do as well, but BM has a more "active" desk
C) Cost. The Colt is a better product, but differences are very subtle, and the newbie cannot differentiate the margins. Therefore it would be a bit more money unnecessarily spent.
Lastly, I would d go as far as to say the Bushmaster "Patrolman's Carbine, in A3 would be the one if I were buying my first. It has it all. and is reasonably priced.
Oh crap!. Just noticed your from Jersey.
You need to cast a vote for the Republicans fist, since thoise commies have limited your options.
This site has a wealth of information available, and dependable sources for Bushmaster products (don't buy the rifle direct from Bushmaster, as it will cost about 10% more than a dealer. This is a great dealer and has the BM products for less than most--->
Knesek guns )
Look around, ask specific questions and join in on the fun!!
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and by the way........ALL CAPS is frowned upon 'round here