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1911 MK IV Thumb Safety Problem


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#1 Hitman07

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Posted 22 September 2012 - 09:38 PM

How can I tighten the thumb safety on the 1911 MK IV? It is really loose and easy to engage. On my real 1911 the thumb safety will not engage if you simply brush up on it; in other words its tighter.

#2 Chuck S

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Posted 23 September 2012 - 06:03 AM

The cure is the same for all M1911s, real or airsoft.  Drill a small dimple in the front of the safety lock where the plunger meets it.  Brownells sells a marking drill that goes into the plunger tube to mark and drill dimples in both the safety lock and slide stop -- but this won't fit in the Mark-series plunger tube so you have to make a good guess where to shallow-drill the dimple.

NB:  The plunger will escape immediately as you remove the safety lock and unlike the M1911 it's 3 pieces that are not tied together.  In Browning's design the two plungers and spring are snapped together to help from losing the parts which are vital to the pistol's operation.

Enough words, here's a photo of the modification in my Mark I:  :)

Posted Image

-- Chuck

#3 Hitman07

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Posted 23 September 2012 - 10:14 AM

...why could KWA done this to being with...its suppose to be a PTP...

#4 Chuck S

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Posted 23 September 2012 - 11:09 AM

QPTP -- Quasi Professional perhaps.  :)

Don't forget you have to use the slide stop as a slide release to close the slide if locked open.  Hardly professional either!  But KWA has never been to Gunsite!

-- Chuck

#5 Hitman07

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Posted 23 September 2012 - 04:03 PM

I did it Chuck but it is still not as tight as my real 1911 :(

but I dont think it will be able to be pushed up without intention anymore

#6 Chuck S

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Posted 24 September 2012 - 02:29 AM

My right thumb can get sore during a weekend training course with my real M1911 putting the safety on every time we go to low ready or holster.  Not going to be an issue with the Mark I.

-- Chuck




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