Quoted: I was looking at putting a Surefire M73 rail on my 6920 , but if all im going to attach is a light is it needed . I have seen some pictures of a small piccatiny rail that attaches to the base of the front site , that will hold a light . Obviously there is a price difference , what are the advantages of a full rail ? Is it needed . Thanks !
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The small picatiny work great, and look into the Insight M3X light - it's compact, lightweight and very bright (125 Lumens).
Why a rail? That's a very good question. The reason I have a rail on is to mount a light, mount a vertical grip, and free float the barrel for better accuracy. (Some people may say they don't "need" the extra accuracy of free floated barrel in an AR, that's cool. Personally, I like all the accuracy I can get, especially when there zero impact on reliability. There are so many free floating rail systems available, I can't think of a reason why I would buy a rail system that didn't free float.)
You can be put on Picatiny rails on stock handguards for both the light and vertical grip, but they don't free float the barrel.
Of the rail systems, I like the GG&G the best. It gives many more mounting options than other systems, yet is relatively light and compact. And it free floats the barrel for better accuracy.
eland
If you are going to buy a rail system, get one that free floats the barrel.