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Discussion Starter · #1 ·
Hi guys,

I have a MAK-90 that I would like to modify after the AWB expires. I figured I should run my plans by the experienced builders as I haven't had the chance to build an AK yet. As far as relavent tools, I have a drill press, dremmel, xebec press kit, and will soon have a 12 ton press and headspace guages. Maybe plinker 762's jig will be in the near future as well. Yes, I am going broke!

Here's the plan:

1. Replace barrel assembly on the MAK-90 with a poly tech barrel assembly. Is it hard to drill the holes for the FSB, GB, and RSB?? I Dont think they're drilled. It seems like it would be difficult to accurately arrange the barrel on the drill press for this procedure. Here's a pic from www.polytechparts.com:



2. Replace my FSE krink style stock with a real folding Krink style stock and trunnion from K-VAR (i hope its ok to mention k-var on this site). hcpookies website is very helpful as far as this goes!


When pressing a barrel out with xebec's kit, does the ram have to enter the receiver by going in just under the rear trunnion when the stock is removed? How does this work if you have a folding trunnion where there is no opening in the back?

Sorry for the long post. Any advice is appreciated.
 

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Why do you want to replace the barrel assembly? What is wrong with the Mak 90's? Just replace the FCG,Gas piston,pistol grip (US) and the folder which is US. that should do you if I didn't miss anything
 

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it would be easier just to press the barrel parts off instead of the whole assembly.
The only reason I would replace the entire thing would be if the the muzzle end of the barrel is damaged (IE they removed the threads)

Now, for the Krink Folder.... Because your gun is chinese you will have to thin the rear trunion in order for it to work. This is alot of work.
You could look around for a polytech sidefolder, they can be had for around $300.
It is a simple replacement and no new holes will need to be drilled.

If you do replace the standard trunion with a krink, you need to remember that you will need to weld up the old rivet holes.

Good luck
 

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Discussion Starter · #4 ·
Erik,
I figured buying the barrel assembly would prevent me from having to thread the barrel as I don't have a die and guide. Also, it is bayonet ready. (The rifle is already 922r compliant) Overall, I think it would be cheaper to purchase the polytech barrel ($65.00) as opposed to a die, guide, FSB, and GB. I orriginally thought that everything was pinned and ready to go on the polytech but as DrugRunR pointed out, that isnt the case. So, maybe I should just replace the GB and FSB.

DrugRunR,

I think I would just drill new front holes in the folding trunnion to match the Chinese receiver. This avoids welding up the old ones...kinda like hcpookie did.

The other thing i'm concerned about is scratching up the barrel if I remove the FSB and GB. The finish on my MAK is really nice compared to alot of others I've seen out there. Will this scratch it up a bit? I guess I'll have to refinish the rifle to make everything match anyways.

thanks for the input
 
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