New gas block for front sight?

B

bjones870

New member
I want to get the gas block, I put a link at the bottom of this post. What all would I need to do, to get the gas block where the from sight is? I have a delton upper with a fixed front sight. I wanna take that off and put the gas block (link below) and put magpul backup sight on it. So my question is, other than the gas block otself, what would I need to do. Thanks!




Gas block: http://www.cheaperthandirt.com/56372-7.html
 
I assume you have the standard GI front fixed sight.It if held in place by two tapered cross pins that cut into the barrel .
When you knock those pins out you have the 1/2 holes across the barrel.
The gas block you linked to is held in place by setscrews up from the bottom.You would be unhappy if the setscrews wouldn't work out due to the pin cuts.
You might look to the gas blocks that have clamp screws.Your barrel will be .625 or .750,probably,at the gas port.Buy the right size.

I myself would think it over a while.What is your whole plan?What sight system do you want?
 
I wanna take that off and put the gas block (link below) and put magpul backup sight on it.
Click to expand...
I have heard that putting a Magpul BUIS (it's polymer) on a railed gas block is a really bad idea. Gas blocks heat up quite a bit, and heat and polymer don't get well together. I haven't seen it happen, but it makes sense. Best to go with a metal sight.
 
Will the heigth be correct with the rear sight?

I only ask because I recently changed one the other direction and needed a taller front post due to a flat top reciever. All worked out in the end.
 
alloy had a good question. i replaced the gas block on mine with a flat top that i thought would line up with the rest of my rails, for the sole purpose of getting the sight out of the field of view of my eotech. i was very wrong. i even tried maxing out the elevation adjustments to opposite ends on both sights to line them up. still no good. i ended up swapping to a quad rail as well and just put the magpul buis on the end of the quadrail. the lower gas block rail now hosts a green lasermax :)

the magpul buis are great tho. love mine.
 
You can get to where you want, it takes cutting the FSB one way or the other.

If the sling and sight are attached to the same structure, you no longer have a free float.

Sling mounted to FSB swivel, sights and barrel move.
Sling mounted to free float, sights and barrel don't move.
Sling mounted to free float with BUIS on rail, sights move, barrel doesn't.

Think about it, at least with the FSB set up issue, if you move the barrel, at least the sights do to. Sights on the end of the barrel hold on closer than on a AR15 with carbine gas.

Nobody talks about it, doesn't mean it doesn't happen. Most are 2MOA guns, you don't see it unless you go looking for it.

Magpul does not warranty their MBUS on an gas block. Metal front BUIS are recommended there. $100 + later, all you get is the front sight not shadowed in the lower third of an optic.

Leave it, and you have a cowitnessed sight just in case the red dot goes out. Point being, it's cheaper in the long run to buy what you really wanted rather than get by and change it. The FSB removed is a $20 used part which barely dents recovering the expense.
 
bjones870 said:
I want to get the gas block, I put a link at the bottom of this post. What all would I need to do, to get the gas block where the from sight is? I have a delton upper with a fixed front sight. I wanna take that off and put the gas block (link below) and put magpul backup sight on it. So my question is, other than the gas block otself, what would I need to do. Thanks!
Click to expand...

You well need to remove the two tapered pins in your existing FSB, remove the flash hider, is it pinned and welded? Then install the new GB. The Magpul well melt mounted to that GB. I would buy from a different vender.
 
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