well speaking from experience, ive handled a few uppers and components from companys like armalite, rock river, bushmaster, stag, lmt mrp
id say get a bushmaster, a bone stock m4 style one, it wont let you down. bushmaster is fast becomoing a favorite of mine
rock river, and armalites come with bull barrels under the handguards which is basically useless and it saves them money. they also dont come with chrome lined bores standard
bushmaster and stag are closer to milspec in that they are light profile under the handguards, chrome lined, etc, bushies are 1/9 twist and stags are 1/7 standard. real world diffference? none
i havent handled or shot any other brands so i cant give you real advice on anything else instead of just telling you what i hear from other people.
if you go top of the line, you will just kick yourself for dropping all that money on the new cool thing then the new stuff replaces it. so avoid the lmt mrp and noveskes global tactical or any other high priced stuff for now.
standard m4 style rifles prices stay stable and will shoot just as good as any free float rifle, IF you are shooting military surplus ammo, which i bet you will be. if your shooting match ammo. then get a freefloat match rifle, youll see its potential then
ive been saying m4 style because thats what i prefer, but bushie and stag also make great 20" M16a4 rifles too, i assume you want flattop. just get a detachable carry handle
also a note on optics: acogs, eotechs, aimpoints, ARE worth the money, i NEVER regretted buying any of them. do not go cheap on the optics, you WILL kick yourself in the nuts for skimping on them.
stocks:
strongest= a2 stock
cheapest= m4 stock
BEST = magpul m93
again , first hand experience
id say get a bushmaster, a bone stock m4 style one, it wont let you down. bushmaster is fast becomoing a favorite of mine
rock river, and armalites come with bull barrels under the handguards which is basically useless and it saves them money. they also dont come with chrome lined bores standard
bushmaster and stag are closer to milspec in that they are light profile under the handguards, chrome lined, etc, bushies are 1/9 twist and stags are 1/7 standard. real world diffference? none
i havent handled or shot any other brands so i cant give you real advice on anything else instead of just telling you what i hear from other people.
if you go top of the line, you will just kick yourself for dropping all that money on the new cool thing then the new stuff replaces it. so avoid the lmt mrp and noveskes global tactical or any other high priced stuff for now.
standard m4 style rifles prices stay stable and will shoot just as good as any free float rifle, IF you are shooting military surplus ammo, which i bet you will be. if your shooting match ammo. then get a freefloat match rifle, youll see its potential then
ive been saying m4 style because thats what i prefer, but bushie and stag also make great 20" M16a4 rifles too, i assume you want flattop. just get a detachable carry handle
also a note on optics: acogs, eotechs, aimpoints, ARE worth the money, i NEVER regretted buying any of them. do not go cheap on the optics, you WILL kick yourself in the nuts for skimping on them.
stocks:
strongest= a2 stock
cheapest= m4 stock
BEST = magpul m93
again , first hand experience
Would it be like putting 91 octane into a car that doesn't require it, or would you still reap the benefits of the higher angular velocity, like putting a radial tire on a bike that came with bias-plies 
