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21 Actuator Specs


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#1 jpw43

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Posted 31 January 2006 - 10:45 PM

Does anyone here have the actual specs for a 21 actuator? I'm thinking about hasving one made, and don't know if there are any "blueprints" around.
Thanks in advance!
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#2 red cap

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Posted 01 February 2006 - 01:27 PM

The cheapest and easiest way to do it is to cut the bottom "weight" off a military 1928A1 actuator. I did this some years back with a hacksaw (yes, I am completely crazy) and cleaned it up with a file; took about a half hour of sweat and blisters, but, when paired with a 1921 buffer and spring, it worked just fine. You can buy a repo from Doug Richardson for about $400? more?, but you can't go just down to your local machine shop and have them turn one out of the right metal with the right heat treating. Remember, you MUST use a 1921 buffer and spring to avoid having too much velocity to the backward movement and maybe eventually banging out the end of the receiver. Have fun!
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#3 giantpanda4

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Posted 01 February 2006 - 01:40 PM

PK has a hybrid 21 / 28 actuator and spring kit available. It works GREAT! I'll let him fill in the details.... cool.gif but if you do a search you may find old posts about this topic.
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#4 jpw43

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Posted 04 February 2006 - 12:42 AM

Well, I'm in China at the moment and my wife's uncle has a machine shop here. I was going to see if he could produce them at a reasonable cost.
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#5 Merry Ploughboy

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Posted 04 February 2006 - 02:37 PM

jpw43,

Newly made '21 actuators are regularly offered for sale on Subguns for $375.
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#6 NotDeaf

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Posted 06 February 2006 - 01:41 PM


JPW43,

Here’s a link to a person selling the Colt Thompson Actuators on GunBroker.com, it says “new manufacture” maybe he made them? You could always drop him an e-email and see if he has the specs you’re looking for …..

http://www.gunbroker...p?Item=43550874

Thanks

Randy
aka NotDeaf

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#7 Arthur Fliegenheimer

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Posted 06 February 2006 - 01:53 PM

QUOTE (PhilOhio @ Feb 6 2006, 01:18 PM)
QUOTE (Merry Ploughboy @ Feb 4 2006, 02:37 PM)
jpw43,

Newly made '21 actuators are regularly offered for sale on Subguns for $375.

...or in China at $3.75...but better quality. wink.gif

Judging by the Chi Com's version of the TSMG, not to mention current day production tools, clothing, sneakers, etc, I'm not sure about that superior quality label.
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#8 jpw43

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Posted 09 February 2006 - 12:51 AM

I went by the shop yesterday. They can produce the part, and the metal is good. Maybe the earlier Chinese Thompsons were produced in mass quantity, so the quality was bad. Don't really know too much about them.
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