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Old 11-30-2009, 02:12 PM   #1
SBH20Man
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Fixing a sticky Mako trigger - how to

If your Mako exhibits any of the following symptoms, this procedure may fix the problem:
  1. Trigger feels like it catches
  2. Safety won't engage properly unless you manually pull trigger into normal loaded position
  3. Spear shaft will not engage trigger unless you hold the spear in place and manually force the trigger into a normal loaded position, then immediately snap the safety on in order to retain the trigger and spear.

I have found the trigger mechanism on the Mako Predator Pro rail gun to be susceptible to becoming “sticky” if any foreign materials get in the way of the trigger return. There is a very close clearance between the trigger and its guide, and if sand or other gunk gets in the way, the trigger will not “snap back” to a normal position when a spear is loaded.

Tools you will need:
  • Small hammer & Small diameter punch (3mm or so)
  • Screwdriver with phillips head
  • Wooden block (optional)
  • Q-tips
  • 180 grit, 220 grit, and 400/600 grit sand paper



Procedure:

Remove the rail from the gun by removing the two phillips screws just forward of the handle. This will make things much easier to work on.

Next, disassemble the trigger mechanism by first removing the single pin that holds the loading butt in place. Rest the handle on a wood block to steady it.





Next, remove the safety by prying off the “S” button, and then pushing the safety through to the other side. (It removes from the “F” side):





Next, gently pry the trigger cartridge up from the front of the handle assembly. Tapping with the hammer and wood block can “unstick” it without damage.



Remove it by sliding it up and back out of the handle assembly.



THE IMPORTANT STEP:
Clean out the handle assembly with hot water, removing any traces of salt crystals, sand, or other foreign material. Pay special attention to the area where the trigger moves back and forth – clean the track with a Q-tip. Visually inspect for burrs or casting seams – remove with fine sand paper or jeweler's file if necessary (optional)



The final step is to gently sand the areas of the trigger molding that contact the tracks on the inside of the handle assembly. Use 200 grit to bevel the edges, and then the finer paper to smooth and polish the surface. This shot is before polishing:



Once the trigger is polished, test fit the cartridge back into the handle assembly. The trigger should pull and spring back crisply. Also test load a spear shaft to see that the trigger “bounces back” when the shaft clicks into place.

Reassembly is the reverse of disassembly. Make sure trigger is not in “cocked” position before inserting it back into the handle.

Hope this helps others!

-Brent
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Old 11-30-2009, 02:18 PM   #2
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Re: Fixing a sticky Mako trigger - how to

Excellent post!

Cleaning the trigger mech is something that needs to be done every so often.
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Old 11-30-2009, 05:26 PM   #3
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Re: Fixing a sticky Mako trigger - how to

Awesome How-To post! Thanks
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Old 11-30-2009, 06:06 PM   #4
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Re: Fixing a sticky Mako trigger - how to

Awesome post man. I have a Rabi that is having the same issues. Thanks for the help!!
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Old 11-30-2009, 07:21 PM   #5
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Re: Fixing a sticky Mako trigger - how to

A hammer should be first on the list in everyone's speargun field-repair kit!
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Old 11-30-2009, 10:15 PM   #6
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Re: Fixing a sticky Mako trigger - how to

ill take the gun that i don't need to take apart and reassemble to work properly thanks. rob allen and pelaj all the way
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Old 11-30-2009, 10:26 PM   #7
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Re: Fixing a sticky Mako trigger - how to

RAs and Pelaj have had issues too, no such thing as a perfect mechanism
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Old 11-30-2009, 10:27 PM   #8
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Re: Fixing a sticky Mako trigger - how to

Quote:
Originally Posted by Kyle Parker View Post
ill take the gun that i don't need to take apart and reassemble to work properly thanks. rob allen and pelaj all the way
Kyle, you seem like a knowledgeable guy, and I always enjoy your posts. But I have to say that is an asinine comment. I have very high-end firearms (hand made) that I tear down and service periodically. It is not a sign of poor quality that a complex mechanism that gets dragged through sand and kelp gets sticky.

In fact, I'd say quite the opposite; the close tolerances in most finely machined equipment really benefit from scrupulous maintenance in order to keep them in perfect form.

A sloppily-made piece of equipment with lots of loose play and crude machining will typically tolerate foreign materials and require less maintenance.

In my opinion one hallmark of quality is the ease with which something can be broken down, serviced, and then reassembled without damage.
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Old 11-30-2009, 10:30 PM   #9
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Re: Fixing a sticky Mako trigger - how to

I wonder why


Quote:
Originally Posted by FLETCHOSAURUS View Post
Awesome post man. I have a Rabi that is having the same issues. Thanks for the help!!
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Old 11-30-2009, 10:32 PM   #10
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Re: Fixing a sticky Mako trigger - how to

Yes there is = The Kitto M2 and the C4 Roller Mechanism are both flawless


Quote:
Originally Posted by 1shot2kills View Post
RAs and Pelaj have had issues too, no such thing as a perfect mechanism
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Old 11-30-2009, 10:40 PM   #11
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Re: Fixing a sticky Mako trigger - how to

Quote:
Originally Posted by Kyle Parker View Post
ill take the gun that i don't need to take apart and reassemble to work properly thanks. rob allen and pelaj all the way
http://spearboard.com/showthread.php?t=96497
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Old 11-30-2009, 10:48 PM   #12
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Re: Fixing a sticky Mako trigger - how to

Quote:
Originally Posted by ACEVEDO View Post
Yes there is = The Kitto M2 and the C4 Roller Mechanism are both flawless
i was refering to the guns mentioned...but thanks for the extra info i guess
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Old 11-30-2009, 11:23 PM   #13
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Re: Fixing a sticky Mako trigger - how to

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Originally Posted by jfjf View Post
a little super glue and that issues taken care of

go rob allen!!
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Old 11-30-2009, 11:42 PM   #14
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Re: Fixing a sticky Mako trigger - how to

"A sloppily-made piece of equipment with lots of loose play and crude machining will typically tolerate foreign materials and require less maintenance."

I love it. The 'ol AK-47 vs FN-LAR philosophies This'll be great to bring up again in January!
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Old 11-30-2009, 11:55 PM   #15
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Re: Fixing a sticky Mako trigger - how to

Quote:
Originally Posted by 'o Cino View Post
"A sloppily-made piece of equipment with lots of loose play and crude machining will typically tolerate foreign materials and require less maintenance."

I love it. The 'ol AK-47 vs FN-LAR philosophies This'll be great to bring up again in January!
That's a great analogy!
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