I have a 107FR coming that was cut to 14.5" and a muzzle device pin and welded to it.

This may be a stupid question, but I've never messed with modifications on AK variants before. After researching I thought I had a good grasp on what needed to be done to complete the task, but now after reading a bunch of scattered posts on the net from different forums, I'm a little confused.

I want to have the barrel chopped down to 12.5", have the old front sight and gas block removed and a Bulgarian AK-142B sight/gas block combo installed to make it basically a 107CR sbr. This is going to be used with a Resilient Putnik silencer. I thought I would find more info out there on this, but it looks like most people went the cheaper and easier route of starting with the 107CR, but the availability pushed me to start with the 107FR.

Please correct me if I'm wrong on the following:
The barrel on the 107FR can be cut down to 12.5" and use a Griffin 24X1.5MM SUPPRESSOR MOUNT THREAD ADAPTER  for the Putnik to attach to.
The AK-142B should line right up to the old gas block on the 107FR with no redrilling for gas needed.

So work needed to be done to accomplish my desired goal:
Cut and crown barrel down to 12.5"
Check concentricity
Remove original front sight
Remove original gas block
Add AK-142B
Done?

Do I have that all correct? and thanks for the help dealing with an AK newb.

Maybe* have about 3/4” of barrel past the new front sight block to thread in 1/2x28 or 5/8 or whatever so you can have the suppressor threads concentric and not have to worry about the fsb being concentric to the bore. You can cover that up with the brake if you want it for looks. Just an idea.

seen this done, and it works, but concentricity still needs to be checked. The 107FR is Bulgarian, so you need to make sure you get the Bulgarian 104/105 FSB (I didn't check your part #), it's a direct replacement for the gas block.

I have done this several times, and I went ahead and used an 11 degree crowning tool too while I was in there. Made a bit of a difference for me.

TX-Zen has done the threaded barrel past the FSB before, but I do not think he is using that method anymore. The other option is to get a mount that is a face mount to the barrel and FSB. Get a rod, and then using a 90 degree crown you can adjust the face to align the suppressor to the bore.

Hope that helps. Will be a great rifle when you're done. I've said it before, the 105/104/102 is the best pattern of all the AKs in my opinion. Very handy and still uses a majority of the furniture out there.

Who summoned me to the heathen caliber forum


@mindfull I'm replying to your IM, but check this out too: (Scroll down for the rod test in particular)

Here's an example of the barrel threaded past the 24x1.5 FSB


With the Sandman QD mount


Here's the Griffin 24x1.5 adaptor. They make these in 1/2x28 and 5/8x24




JMac put out a pretty bad ass 24x15 adapter for Dead Air KeyMo mounts, and I like it quite a bit as well. It can direct thread to some types of suppressors also but I wouldn't worry about that right now (Posting that more for others who may be interested)





I almost never check this forum, so hit me on IM if you have questions, or @ me here

Thanks for the replies.
I've decided to have the barrel cut and flush with the 142-B and just thread onto the 142-B and see how I like it and how secure the putnik stays.

Some interesting options

I just realized this heathen forum is actually the only forum I post in haha. I've been offline so much lately that I had it in my head that I lived in the 5.45 forum, but there isn't one, and Dryflash hasn't read my mind and created one just for me

That's because Dryflash is a member of the 7.62 master race like me.

Happy Independence Day....fucker.

Thats a great suppressor link, very nice resource. Thanks for posting that.

Well we're just having a little fun, and you're a buddy too, like SGT. Hulka on Stripes, you're our beloved big toe!

Besides, I wouldn't know how to act if I went a full month without TX-Zen calling me an ignorant hillbilly for still using 7.62.

Happy 4th to you too my friend!

Lol! Happy 4th back at you...HEATHEN!!!!

No worries

I had a million questions too when I started messing with suppressors, so I decided to keep notes and hit the main points so that it might help guys out

But you are an ignorant hillbilly for using that caliber haha

Happy 4th to you too Dry!

I just threw up a little in my mouth....

Heathens everywhere!

I'm gonna go shoot some 5.45 today to ward away the evil my eyeballs have seen this day

it takes a few martyrs, but eventually the ones you never suspected will come out of the woodwork and Deus Vult your heathen caliber.

I keed of course, I have my share 7.62x39 rifles, but they're mostly for the collection. My104 though, that's a serious rifle.

It's a tough job, but somebody has to keep the chipmunk horde off us. Vicious ill-tempered rodents with great sharp teeth.

Anyhoo, back on topic you lot. I think that hole is for lubrication, is there a grease zerk up in there?

Oops, wrong thread.

R.O.U.S. is what I think you meant.

Finally shot the Putnik today. Its a beast.
I'm pleasantly surprised by the tone and wow, talk about recoil mitigation.
Torqued it to 30ft bs per Tyler at Resilient and ripped off 30 rounds. Didn't come loose at all. I'll have to shoot a lot more just to make sure, but im digging it.

Eric at Stronghold Armory in Missouri cut the barrel down to 12.5", crowned it and installed the AK-142B front sight/block for me. Super fast and fantastic work.



Loving it

How gassy is it?

I didn't notice any gas whatsoever.