AR flat top comparison

Glock23gp · Apr 29, 2013

Im looking at buying a new RRA ar-15 that has a front sight but I like the style without. Wondering if someone can explain the difference and/or if its possible to change it. Here are couple pics for an example

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hatchj · Apr 29, 2013

It's just a different gas block. The gas block in the first picture is the front sight. The second it's the railed piece at the end. I don't know how difficult it is to switch them out, but it's just swapping out one part for another.

iamme · Apr 29, 2013

A2 FSB (1st one) should be drilled/pinned. The "issue" you'll have swapping to a lo-profile gb is you most likely will not be able to re-use the taper pin holes and will be going with a set-screw or clamp design. Set-screw with the barrel dimpled seems to be the slightly preferred.
Driving out the FSB pins is not a tough job, but if they're installed right they will take some solid hits to get out. This means keeping the barrel/upper secure.