Mechanical proto slg

[Trbo323]

Been thinking about this for a while. I kind of want to attempt it at some point but still trying to work out the details in my head.

Can't just drop the sear, the marker will go into full auto but, since it uses air to reset the bolt I was thinking, what if the air was intercepted before getting to the bolt, routed to the trigger such that the air will only push the bolt back when the trigger is forward. After firing the marker past the regulator (with the exception of hoses at the trigger) would essentially be de-gassed

This also opens up the possibility of using a ram to punch the sear

So in a nutshell,

Trigger forward, air is intercepted after the regulator, comes down through a 3 way and back up into the bolt as it normally would.

Trigger back, air intercepted but routed through the 3 way to a ram to punch the sear, nothing going to dump chamber

I would probably need to rely on the sear spring to reset the ram

Anyway, anyone familiar enough with the slg to comment? See any problems I've overlooked?

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[William the Third]

Why not just use a sear configuration like in most blowbacks? The bolt (striker/hammer in a blowback) rest against the sear, pushing it forward so the trigger can now trip it. The trigger trips the sear, releasing the bolt, and because the sear is slotted the sear spring pulls the sear back and up so it no longer is connected to the trigger. The bolt returns after firing and is caught by the sear. The trigger is released, allowing it to reset and now be ready to trip the sear again.

[Trbo323]

Why not just use a sear configuration like in most blowbacks? The bolt (striker/hammer in a blowback) rest against the sear, pushing it forward so the trigger can now trip it. The trigger trips the sear, releasing the bolt, and because the sear is slotted the sear spring pulls the sear back and up so it no longer is connected to the trigger. The bolt returns after firing and is caught by the sear. The trigger is released, allowing it to reset and now be ready to trip the sear again.

Because of the way the sear is in the slg. Since it's held in the body not the frame it makes everything much tighter to start with but,

1) I'm not positive but I'm not sure there is enough room in the sear itself to slot it

2) the way the sear spring is, there's no rearward force, I would have to engineer a completely new way to push it back, this isn't a huge one though, I think it's possible

3) probably the biggest problem I see with your idea there and the thing that killed it for me, the sear catches the bolt when the bolt is very very close to it's maximum rearward travel. In stuff like spyders and tippmanns there's that little extra amount of travel that the system moves because of the slotted sear

On the plus side though, running it off a pneumatic switch I'm hoping will really lighten the trigger pull

I'm not sure if I'll need a LPR or not, guess I'll have to go see what the operating pressure is but I think it's low enough that I won't

Basically if this works, I'm hoping it will be something like a poor man's pnu-mag since the bolt system is pretty close to an automag without the spring

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[zinger565]

Definitely doable to set it up as a poor man's pneumag, timing is going to be tough, ie/making sure the sear ram is released faster than the bolt moves back, otherwise you just created a mechanical auto-response trigger

What will be interesting is how you're going to intercept the air. IIRC, the air travels through the body and doesn't leave.

[Trbo323]

Definitely doable to set it up as a poor man's pneumag, timing is going to be tough, ie/making sure the sear ram is released faster than the bolt moves back, otherwise you just created a mechanical auto-response trigger

What will be interesting is how you're going to intercept the air. IIRC, the air travels through the body and doesn't leave.

timing is going to be tough, ie/making sure the sear ram is released faster than the bolt moves back, otherwise you just created a mechanical auto-response trigger

.

That's just it though, if the incoming air to the bolt is cut off the bolt will stay forward until the air is returned.

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[zinger565]

True, but on trigger release the ram will have to move out of the way so the sear can reset before the bolt finishes its back stroke. That is unless you use some sort of pulse valve for the sear ram.

[Trbo323]

True, but on trigger release the ram will have to move out of the way so the sear can reset before the bolt finishes its back stroke. That is unless you use some sort of pulse valve for the sear ram.

That's a good point I haven't thought about that

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