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Re: MAK-90 rebuild
Posted: Sat, 11 Jan 2014 21:27:24
by safaridave
The FSB was pretty easy. I used my press tool to support the FSB and used a couple of pennies to protect the barrel crown. The tolerance was TIGHT... it didnt move until I heard a loud BANG and then it jumped a few millimeters... then it went out smooth.

- fsbpress.jpg (66.29 KiB) Viewed 2450 times
Got it out most of the way but I ran into an obstacle.. how to get it completely out?

- fsbpress2.jpg (53.39 KiB) Viewed 2450 times
Seems a 10mm socket is perfect for pressing the barrel the rest of the way out.

- fsbout.jpg (133 KiB) Viewed 2450 times
Next the gas block...
Re: MAK-90 rebuild
Posted: Mon, 27 Jan 2014 14:30:24
by safaridave
My apologies for my long absence. Anyway...next is the Gas Block. Not as easy, though.
I used a small pipe tool to wrap around its collar.

- GBoff.jpg (104 KiB) Viewed 2412 times
But the darm support point broke and I had to cut it off..

- gbcut.jpg (125.95 KiB) Viewed 2412 times
Re: MAK-90 rebuild
Posted: Mon, 27 Jan 2014 14:41:50
by safaridave
Here is the barrel ready to be repoped. I eyeballed the alignment then used a string from the rear sight to the front sight to see if all the parts lined up... they did.

- barrelrepop1.jpg (105.63 KiB) Viewed 2412 times
Now I press on the gas block..

- GBon1.jpg (45.08 KiB) Viewed 2412 times
Once the GB is on you MUST make sure the gas port lines up with the gas port on the barrel.
Re: MAK-90 rebuild
Posted: Mon, 27 Jan 2014 14:46:07
by safaridave
So I take an appropriately sized drill bit..

- GBon2.jpg (93.09 KiB) Viewed 2412 times
and make sure it goes through...

- gbon3.jpg (105.08 KiB) Viewed 2412 times
Its important to do this... the gas port is critical to the rifle cycling rounds. If its too small (by being misaligned), it wont cycle reliably.
If it would have not went through I'd just press it off and realign it. Use a flashlight to make sure the alignment is correct laterally and vertically.
Re: MAK-90 rebuild
Posted: Mon, 27 Jan 2014 14:54:11
by safaridave
Another check to do is put on the upper gas tube to make sure it aligns. The bolt carrier and gas piston should be in as well to make sure they cycle smoothly.

- gbcheck1.jpg (97.65 KiB) Viewed 2411 times
Now to get the FSB on... a little tougher but not too bad.

- fsbon1.jpg (56.58 KiB) Viewed 2411 times
Now the barrel is looking like it should..

- barrelcomplete.jpg (115.03 KiB) Viewed 2411 times
Time to drive the pins back in.
Re: MAK-90 rebuild
Posted: Mon, 27 Jan 2014 14:56:57
by safaridave
Now that the pins are in... (a lot of hammering involved). The "un-neutering" of the barrel is complete, and it will now hold a cleaning rod and bayonet like Mikhail would have wanted it to.

- barrelcomplete2.jpg (82.08 KiB) Viewed 2410 times
Now we should focus on the reciever.
Re: MAK-90 rebuild
Posted: Mon, 27 Jan 2014 15:07:55
by safaridave
Here is my trigger guard jig and reciever. Yeah its been a while since the receiver showed its face... but hopefully it will be made whole again

- tjig1.jpg (103.09 KiB) Viewed 2410 times
I have preplace the rivets in the holes with the guard and selector stop.. (make doubly sure the selector stop is on the correct side)

- TG1.jpg (110.43 KiB) Viewed 2410 times
Place it on the press and get ready to crush.

- tg2.jpg (63.48 KiB) Viewed 2410 times
NOTE: since this is a Chinese AK there is only one rivet per side of the TG. Normally you can place all 5 rivets, including the rear in the jig and press. Not so here... I have to use one pair of the jig's rivet dimples and the do the rear rivet in a separate operation.
I find doing the TG first is easiest. You dont have to crush the rivets around the lower rails... and since this flat uses RPK rails... they are HUGE and might get in the way.
Re: MAK-90 rebuild
Posted: Mon, 27 Jan 2014 15:18:28
by safaridave
Here are the crushed rivets.

- tgcrushed.jpg (77.64 KiB) Viewed 2407 times
Now for the rear...

- tgrear1.jpg (80.99 KiB) Viewed 2407 times
And its done...

- tgrear2.jpg (119.39 KiB) Viewed 2407 times
Now its time to fire up the spot welder. More pics shortly.