Ak barrel gurus

[Paul053]

Got a parts kit lying around with an ak builder barrel in 762, and I wanted to build it up using the bolton block. By getting rid of the traditional front sight and muzzle device detent what do I have to do to the barrel to be able to install a muzzle device like the fsc47?

[Ryan in SD]

Crush washer or loctite.

[nicoroshi]

I am unsure what a 'bolt on block' is but I do have experience with the PWS FSC47 muzzle brake.
It screws on standard 14x1mm LH threads of an AKM/ AK-47.
It does index off the detent in the FSB though so removal of the detent would pose an issue locking the brake indexed in the proper position.

[munkeeboi]

all i can suggest is locktite or pinning it on. maybe a picture of this bolt on block so we know what you are trying to do

[SJgunguy24]

all i can suggest is locktite or pinning it on. maybe a picture of this bolt on block so we know what you are trying to do

Picture a combo block for an SBR 100 series AK. Except now there's 5" of naked barrel out there.
To the OP, your going to want to lock tite that and just keep an eye on it in case it starts to loosen up. Jim Fuller usually chops those down and silver solders or pins the AK battle comp in place.

[Paul053]

I've never pinned a barrel. How do you prevent drilling into deep for the pin? Most folks eyeball it or try measuring the barrel thickness with calipers?

[Paul053]

I've never pinned a barrel. How do you prevent drilling into deep for the pin? Most folks eyeball it or try measuring the barrel thickness with calipers?

[Carsgunsandchics]

I have two of the Bolton Gas Blocks, I got them from Venom Tactical. I use one on my Paratrooper PSL with a crush washer and one on my Draco which will also use a washer.

[Paul053]

That's the thing, there is nothing on the end of my barrel except for the threads. What are the crush washers crushing against?

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[kcstott]

Your going to have to press on a sleeve possibly even silver braze it in place then you'll have something to seat you muzzle break on.

[Carsgunsandchics]

That's the thing, there is nothing on the end of my barrel except for the threads. What are the crush washers crushing against?

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On both of mine the washer is up against the Bolton gasblock face.

[nicoroshi]

Seeing SJGG description I can picture it.
I would drill, and pin it personally.
As to your question of how deep. I drill through the brake (you'll know when it gets to the barrel as you'll hear, and feel the bit drop).
Drill slightly into the barrel then remove the brake.
Now you can see exactly how deep you're going into the barrel.
I use an end mill so that the bottom of my hole is flat, and caliper the thickness of the barrel wall then use a depth gauge as I run the end mill to ensure I am into the barrel but still stay out of the bore.

[ar15barrels]

I've never pinned a barrel. How do you prevent drilling into deep for the pin? Most folks eyeball it or try measuring the barrel thickness with calipers?

I use the z-axis DRO on the mill to watch how deep I am drilling.
You only need to be about 0.030" into the threads...

[nicoroshi]

I use the z-axis DRO on the mill to watch how deep I am drilling.
You only need to be about 0.030" into the threads...

I didn't have that option before........but I will soon
My mill, and lathe have been ordered, and will ship soon.

[Paul053]

Having never pinned anything before. Once the muzzle device is pinned how do you prevent the pin from walking out? Or is it like a rivet that when pressed with enough force that it expands out sideways and holds itself in?

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