Quoted:
What is the difference in rails. I saw one that said free installation... Do the rails have to be mounted permanently ? I just bought bought a 6920 and I want to put accessories on it.
The factory hand guards just pop on and off which is what I want to do, or relatively easily.
any suggestion ? feel free to point out the obvious stuff, because my knowledge is very basic...( my first AR was an A2 i bought 2 months ago)
Yes and No. There are railed handguards out there that are two piece. Like your factory plastic handguards. Take them off, install new ones.
Or the other option is a free floating set, usually these styles require the removal of the muzzle device,FSB and in some cases, the factory barrel nut is replaced with one that is supplied with the handguards. I would look all over this site( ARFCOM) Look at vendors that avdertise here( Look below your user name
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Handguard suggestions are tricky, kinda like suggesting shoes, or motorcycles. Everyone has different wants or needs. Some may want the most expensive, just because, others may look for function, fit and quality. YMMV