Open bolt 1919A4 / L3 trigger frame.

[Brit plumber]

I'm hoping some of the older Armourers (Your not old Peter) here may recognise this open bolt 1919 trigger frame. It's not the same as the one on my L3A2 and it doesn't look like the pics I have of the L3A3/4 so any ideas?

Information

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[Peter Laidler]

Not one I have ever seen.............

[browningautorifle]

This looks like a conversion to semi auto form full. The ones we call converted auto here in Canada. Is that what you have? The trigger used to go in the top of the assembly, the space in the top there in the last picture is where it would go. This one is a different mod to make it fire only single rounds.

That's what it looks like to me. Where'd it come from? I was a machine gunner for many years on this gun.

[Brit plumber]

It came in a box of L3 parts, other than that I've no idea where it originated. I've been trying to figure out how it would work but I just can't fathom it out. The reason why I was thinking it was an open bolt conversion is because there is no way for the trigger to depress the sear part (Or what ever it's called) so like the L3, the sear must be tripped by something else when the bolt is fully home. Would the Canadian semis be on an open bolt or closed?

[browningautorifle]

They were a closed bolt deal, just like the original. The idea was the trigger would trip the sear and then slip off so it couldn't do it again without a re-set. I'm thinking the other trigger is missing, the original one which would have been cut short and the back half removed. The flat projection with the spring attached would have pushed it up when raised and then slipped off the stub to cause only one shot. The gun will cycle and this has to be released and it re-sets...follow? So, it's missing the old trigger above. Short trigger...cut off...

[Brit plumber]

Thanks Jim, that makes sense, I never thought of it having 2 parts to the trigger.

Cheers.

[browningautorifle]

Which means you need an original trigger to cut and place in so it works...where's the rest?

[emmagee1917]

Not any semi-auto conversion set-up that I've seen. Most now use the KMP set-up . Google it for pics. It uses a two piece trigger , but looks quite a bit like the one piece trigger when assembled . The trigger here IS here and has a "T" on the front pined to the frame. The short bar with the spring is way too short to reach the bolt's sear when it's closed . Most all semi-conversions use a larger sear than a full that the trigger pulls down to release the firing pin and then the trigger has to be released to re-set to allow the sear to be pulled down again.
It could be an open bolt conversion of somebody's , or there was an old semi-conversion that involved using an AR15 hammer in it and not a pull-down sear.
I believe one like this appeared on the 1919a4.com boards a few months ago , and noone over there recognised it.
Chris

[browningautorifle]

Once again Chris...the original trigger has to be cut off and the front remains to pull the sear down. This flat paddle pushes up on the back of the cut off trigger and then slips off upward so the whole thing need to be re-set by releasing before re-firing. If he was to re-install the front of the original trigger, you'd see what I'm talking about. The "T" on the pictured trigger is just for a pivot point. This wouldn't work for an open bolt, there's nothing to hold the bolt open. The accelerator claws and tips won't do anything in this case but lock and unlock the barrel extension. If you haven't studied one of our converted auto's...they're an engineer's nightmare.

[emmagee1917]

I think I folow you. I've looked inside of a couple of semi conversions , but have not really studied them . I'm a full-auto guy.
Thanks , Chris