How thick would a barrel have to be for this

daniel craig · Mar 25, 2020

So the FN AR competition has a forward rail for the mounting of an after market iron sight (see pic). I have an old rifle that the barrel was cut down on and I had to cut off the front sight to do it, how thick would you need for something like this?

Obturation · Mar 25, 2020

Not too thick of you're going to solder it on. Why not get a full length handgaurd and mount sights to that?

daniel craig · Mar 25, 2020

It would have to be custom-made. This is an old WWII era POS boom stick (but I love it and it works).

Obturation · Mar 25, 2020

I see, sorry I misread. I thought it was an AR.
A gunsmith can put a proper sight on for you for not too much money. I think the chunk of rail may look weird and set the sight pretty high.

Col. Harrumph · Mar 26, 2020

Usta bee you could get a sight that came already mounted on a sleeve.

daniel craig · Mar 26, 2020

Obturation said:
I see, sorry I misread. I thought it was an AR.
A gunsmith can put a proper sight on for you for not too much money. I think the chunk of rail may look weird and set the sight pretty high.

it would have to be set pretty high because there's a rail on the back for the scope to attach to. Fine I admit it's a Mosin-Nagant that had been sporterized LOL. The rail sits up too high to be able to use the back sight and a standard size front sight side have to get a rail for the front at the same height is the back. though it might be a waste of time cuz there's not a whole lot of room on the rail for my scope and an iron sight I have to choose one or the other unless I went with like a red dot or an ACOG or something. I just use it for hunting so a fixed magnification ACOG style sight would be cool.

Jackrabbit1957 · Mar 26, 2020

Didn't Redfield make scope rings that you could see iron sights through? Would that be practical for your application?

daniel craig · Mar 28, 2020

Jackrabbit1957 said:
Didn't Redfield make scope rings that you could see iron sights through? Would that be practical for your application?

Potentially, I still need to add the sights though

boom boom · Mar 28, 2020

Brownells has what you want as far as commercial slip on front sights or sight ramps that are soldered on using soft solder and usually secured by a screw. Depending on how much barrel is left, you might want to consider getting Mosin carbine front sights. @Joshua M. Smith might be a good one to contact on that. Barrel blast in a shortened Mosin can be an issue so you might consider having the muzzle threaded for a muzzle brake.

But, you will need to calculate sight height for it to shoot to POA. I am assuming that the rear sights are still on, but then if not, Brownell's sells commercial replacement types too.

This is a sight height calculator from Brownells where you simply plug in your numbers https://www.brownells.com/aspx/learn/learndetail.aspx?lid=13186

Putting some AR rail type on the front sight will change the POI as it affects barrel harmonics and maybe not in a good way.

How thick would a barrel have to be for this

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