Hi all, I looked around a bit for info on this, but I couldn't seem to get this through my noggin

please redirect me to the correct thread if this has been answered ad infinitum

 

Ok- while I wait (and wait) for my FID to arrive ive finally settled on a 16" M4 kit from del-ton

two of the options im looking at are:

-standard A2 front sight base, no bayonet lug

-F marked front sight base

 

I think I get the F is marked for flat top uppers, and is a little bit higher than a standard A2, my goal is to have a flat top

with some sort of reflex/holo optic, and a BUIS, with the ability to co-witness in the event of optic failure

(In case the paper targets get hostile at the range, gotta be ready)

Will a Standard base suit my needs with a little adjusting?

Or am I better off getting the F marked and neutering it?

I like that it ships with no bayo lug, taking a grinder to my brand new barrel make my tummy hurt a bit!

Again, thanks for any help, and sorry if Im :thsmiley_deadhorse:

 

Dave

There are couple of options that will work just fine.

1. Get the F-marked, and grind the lug down. Not too hard to do. Even a basic dremel will take care of it.

2. Get a taller A2 sight post. They make ones that are slightly longer to compensate for the non-F marked front sight base.

http://www.midwayusa.com/product/810857/dpms-front-sight-post-square-extended-030-higher-ar-15-matte

F marked bases are tiny bit higher made to align with flat top uppers. To be honest, I don't think it matters. You have quite a bit of adjustment in the front sight post anyway and odds are are you are not going to need the extra height for any reasonable type of zero. In my opinion co-witnessing is not critical, and although I can shoot my irons through my red dot, I actually have sights folded (including my fold down barrel mounted front sight) because sometimes I use a red dot and some times I use a scope and I don't like the reduced light through the scope from a permanent upright front sight. My solution is high quality quick detachable mounts for the optic (Larue, ADM, etc) which return to zero when swapping optics and take a second or two to remove.