MAX-11k Conversion

medphys

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The Max-11k.

Posted with permission from Richard Lage.

To start, I’d like to explain why I did this. Some of you might be think that it was just to have something different. That is true, but only it’s only a small part of the ‘why’.

The first goal was to shorten the upper to get a better look and feel. I had been trying to get my TASK converted upper to be nice and tight to the body, but could never figure out a good way to do the foregrip. Eveything I tried just looked crappy to me. Interestingly, two critical things happened following the Fall, 2010 Knob Creek shoot: The Lage MAX31 upper was sneaked to the public (whoops… I wonder who did that ;)) AND AZ Doug posted a picture of his shortened MAX-11 upper. It had never occurred to me that the MAX-11 upper would be a good candidate until AZ Doug’s “k” version. His is about 2.5” shorter than a stock MAX-11 upper and just looked very cool to me. Also it prompted someone on the UZItalk forum to sell an “extra” upper they had for a great price. I bought it before it ever went public.

Fast forward four months or so of me flip-flopping back and forth about whether or not to do it, plus a period of time when I was going to sell it and go back to the TASK configuration. I had been shooting the MAX-11 a bit and had noticed that it felt very different than the TASK upper. The bolt/buffer assembly in a TASK upper is very linear and has little muzzle rise. The MAX-11 upper always felt front end heavy and had more muzzle rise. Others may have a different opinion on this, but this is what I felt and was the second determining factor for the conversion.

Another small reason that recently occurred to me is the fact the Michigan does not allow us ‘normal’ people to have suppressors. When I signed up to run a match up there, I realized that my TASK upper is really set up to be run suppressed. It just handles WAY better than with out it. This means that I would have to run the MAX-11 to be competitive, and thus practice with it.

So the snow is thawed, the wife and kids are away, and I have some new hacksaw blades and a new file. As Captain Picard would say “make it so.”

Enjoy.



Before:
2-2.jpg


The bolt: I started with a Tactical bolt and cut about 2.5” from it. This is more than the amount I removed from the upper. I added a chunk of lead in the back section to put some weight in in order to bring it back to the factory Tactical bolt weight; hopefully to reduce muzzle rise.
5.jpg


The underside of the bolt: The underside of the bolt and the top-backend of the trunion were tapered in order to allow the bolt weight to ride over it. A stock MAX-11 bolt rests on the trunion while in motion, but when you shorten it, it comes back beyond the trunion and will collide with it when it moves forward, unless of course, you taper everything.

10.jpg


The trunion:
7.jpg


Cut #1: I only cut the upper back to the third vent hole. This was to allow enough room to grab the forgrip while using the high mount metal forgrip. Maybe I’ll add a VFG at a later date. Who knows?
6.jpg


Cut #2:
8.jpg


The cut foregrip:
11.jpg


Finished: Still not sure if I'm going to cut the barrel down. I need to add a Carleson Compensator and play with it a while first.
12.jpg


13.jpg


IMAG0514.jpg


:)
easy.jpg
 

strobro32

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You so crazy!

That looks good. What was the final ROF with the lead block added?
 

medphys

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Before, with factory Federal and WWB 115, it was around 720. Now it is a bit faster, but I need to video a mag dump to figure it out. I could still get singles pretty easy, but haven't had a chance to really dig into it. I might end up cutting down a standard bolt weight instead if I need to go slower. Not sure yet though. The bolt still has the same feel as a stock Max-11 upper and it doesn't hit the back of the receiver so that's a good thing. Hopefully I'll get to do some playing this week to get a better feel for it.
 

medphys

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06sandstone said:
LOL
Your the Man Medphys ! It takes a big set of BALLS to hack into one of those uppers.

Ehh... these are toys to me and this stuff keeps me busy. I try not to do things too crazy though... It actually was an easy project and only took me a few hours. Just cut straight :) The foregrip was the hardest part and was the main thing keeping from starting the project. I didn't know how I was going to do the it until I actually had it cut. Then it all kind of fell into place.

Besides, the MAC10 forum has been so boring lately, I had to do SOMEthing to get things rolling again.
 

Jmacken37

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Nicely done Medphys! I love how many smart and innovative folks we have here.

Jake
 

aspiderfreak

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Very nice! Thanks for taking the time to document your conversion process.
 

medphys

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Jmacken37 said:
Nicely done Medphys! I love how many smart and innovative folks we have here.

Jake

Ha-ha, thanks for the compliment! I'm not really an innovator though; more of a copycat :)
 

medphys

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Another pic of the foregrip. Since I cut away the metal section that had the material and holes for the screws, I had to change the location of the front section. It is about 1/4" higher than stock.

It still needs some work though.

IMAG0518.jpg
 

ArevaloSOCOM

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Could this be done to work with a 22 max-11 kit????????

That's what I would want.

Looks GREAT!!!!!!!!
 

medphys

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ArevaloSOCOM said:
Could this be done to work with a 22 max-11 kit????????

Not sure. As long as you aren't modifying the 22 kit bolt, I don't see why it wouldn't. However, if you shorten the barrel of the MAX22 kit, you might start to experience reliability issues. Since I don't have either kit, I can only speculate.
 

medphys

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Note to self: the trunion area where the receiver pin is gets hot following shooting. I guess I should have expected that :rolleyes


ROF results and video coming later... stay tuned.
 

medphys

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The ROF using Federal 115gr and WWB 115gr was not noticeably different than the stock tac bolt. Before I had calculated about 720 RPM and today I got very similar results (using my archaic techniques). The Federal is definitely softer than the WWB though.
 

strobro32

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medphys said:
Note to self: the trunion area where the receiver pin is gets hot following shooting.

You're not really an official Max-11 owner until you blister your left hand with the receiver pin doing drum dumps. ;)

After my second crescent pin burn, I invested in the K grip.
 

medphys

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medphys said:
The ROF using Federal 115gr and WWB 115gr was not noticeably different than the stock tac bolt. Before I had calculated about 720 RPM and today I got very similar results (using my archaic techniques). The Federal is definitely softer than the WWB though.

Now that I think about it, I bet the stroke has increased enough to keep the ROF the same because it felt like the bolt was hitting the buffer slightly. Need to check that next and maybe add more lead.

Matt- ouch!
 
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