replacing fixed site on my ar, advice please

newshot

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Hello wise and powerful CGN-ers,

I want to put a folding front site on my AR so that the site picture is a little less crowded with my red dot. I know physically how to remove it. It is a pinned one (armalite m15 14.5 inch barrel). I don't think free floating a 14.5" barrel barrel to get a top rail to put a folding buis on is worth it and would add an unnecessary few hundred dollars to the build. Can anyone recommend a railed gas block and buis combo?

I need the buis to line up and the different planes of a railed gas block and the rear top rail don't line up with most buis. Also, I assume there is different quality gas blocks and it seems like a fairly important part to the functioning of the AR so I would like a reliable one!

Please be specific:

1) Which gas block?
2) Which model buis?

Purpose is target shooting and 3 gun. It gets bashed around a fair bit.

Thank you for sharing your knowledge and experience.
 
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