LPR Foregrip

[BLachance75]

Any chance you could mock the grips up on a AM/MM length rail.

[luke]

Ok, here you go, actually it's doesn't look to bad, and much nicer in person. :)

[knownothingmags]

will there be a place on the right side and the bottom for air inputs?
so we can have a gas thru effect for the valve?

[BLachance75]

I really like the look of that on the am/mm rail. I'm in when you get to the plain foregrip version.

[luke]

will there be a place on the right side and the bottom for air inputs?
so we can have a gas thru effect for the valve?

Yes of course, that's been pretty much covered (One page back shows pictures of the port)...
This is a gas-through foregrip with bonus LPR.

Run air supply to your valve off this port.


This is the bottom of the LPR-FG, air supply in and low pressure adjustment.
This is recessed to hide your air fitting, plus it lets me remove some dead weight.

[need4reebs]

Half of my testing parts arrived yesterday, the remaining are in route as of this morning.
I have some machining to do on the testing "apparatus" in order to get this set up, but nothing major.
I believe I have come up with a way to do some "controlled testing" without having to setup a marker. I can monitor recharge rates at a set trigger pull per second/minute without guessing, should be interesting.

Is there any verified data for BPS/CPS running the MSV-2?
Initial tests will be set at 11 then 22 cycles per second. This is actually a double test of sorts, I'm curious how well the MSV-2 performs at a higher cycle rate. I'm thinking 11-22 CPS will cover all expectations but I welcome your input.
I'll test the LPR at different ranges but is there a PSI you guys have found that works best?

[need4reebs]

and slide check valves are very nice for testing tha LPRs…10/32 threaded slide checks that is

[luke]

I really like the look of that on the am/mm rail. I'm in when you get to the plain foregrip version.

Foregrips are probably a ways off, sorry.

This LPR is actually phase number 2 of 4 of a single project. Each phase is dependent on the previous being a success, meaning functionality and customer support. Phase number 3 and 4 have not really been discussed on the boards yet. If the LPR gets off the ground we can move forward with the rest. :)

[luke]

yeah man i was actually selling tha extra LPR testers that i built…an electro/pneumatic set up would be the way to go for testing tha CPS…if it can pass tha test of that then a MSV-2 will easily work with out any shoot down. test it in full auto at 27BPS for a couple of cases of paint and you should be all good.

I'm not testing on a marker with paint. This will be a mechanical test using my knee mill to actuate the MSV-2. I can adjust my RPM to simulate trigger pulls per second.

I will actually chuck this up the vice on the milling machine to do my tests. I have a 'due-hickey' that will mount in the spindle and will actuate the MSV-2, think camshaft but with 2 lobes.

[need4reebs]

I'm not testing on a marker with paint. This will be a mechanical test using my knee mill to actuate the MSV-2. I can adjust my RPM to simulate trigger pulls per second.

I will actually chuck this up the vice on the milling machine to do my tests. I have a 'due-hickey' that will mount in the spindle and will actuate the MSV-2, think camshaft but with 2 lobes.

kool kool

[Patron God of Pirates]

Ok, here you go, actually it's doesn't look to bad, and much nicer in person. :)

^^ Tits. I had a feeling the single trigger and shorter rail combo would look better.

[Fred]

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This is the bottom of the LPR-FG, air supply in and low pressure adjustment.
This is recessed to hide your air fitting, plus it lets me remove some dead weight.

K probably stupid comment... I want the a straight front design, without the grippy cuts, and just chop ALL that extra meat off... don't need to hide the fitting.

[knownothingmags]

K probably stupid comment... I want the a straight front design, without the grippy cuts, and just chop ALL that extra meat off... don't need to hide the fitting.

+1

[Laku]

That recession to hide the fitting looks pretty deep. Am I right in assuming that would make usage of CCM fittings harder and they would need an extension part to fit there?

[luke]

:) :) The bottom cavity is less than 1 inch deep, 0.8715" to be exact.
If you measure your fittings you will find that this is not excessively deep.
It is designed for maro/micro fittings and is wide enough to fit a 7/16" deep well socket. I believe some straight fittings can be installed with an allen wrench,
but I'm not familiar with everything on the market so the 7/16" socket should cover everything that is suitable for this application.

Are you guys familiar with the term "form follows function"?
If you study this CAD closely you will see that the shape is wrapped around the internal parts and air passages (form follows function)


Some of the internal cavities are not real clear but I assure "form follows function".

I would be willing to leave the rounded cuts out of the design if that is what you want. But it will increase weight that amount even if it is fractional, it all adds up though.
You guys are saying you don't want the bottom cavity, if I just drill and tap it at the bottom without the cavity it will increase the weight a tad more significantly.
If I 'remove' the bottom of the FG at the depth of the cavity i.e. making it 0.8715 shorter, it will look ridiculous (IMHO). The whole point of the project was building a LPR in a FG, so shorter is out for me.
The cavity is actually ULE milling allowing me to increase the LPR to FG length without adding all the extra weight.
At this time the only change I have planned is to remove a little more off the side edges of cavity on the bottom.

Pictures don't do these two designs justice and don't reflect how they feel in your hands. At some point you have to stop designing and move on with the project or kill it and move on to something else.
To be honest I have so much time (Not to mention $$) invested in this, I'm actually sick of it and am ready to move on to other things.
I'm just too deep to redesign, retool and reprogram these parts, the project is at a do or die point, sorry.
I'm extremely happy with both designs and have to stick to my guns, no hard feelings on my part either way. :) :)