js412000,
I haven't yet posted any pics on the board due to lack of computer skills. In some way I fight with it. Anyway, all I did is take the front part of the bolt and drill a 1/8" hole part way through the back ejector opening and installed a roll pin (do not drill into FP hole)This is the spring stop. Then I took the 42 ejector and cut it down, ground out a elongated slot for a screw stop or cross pin, install a spring behind and you have a ejector plunger. The center line from the FP hole to the bottom of the receiver is 3/4". When a case gets extracted the plunger will push the case down and loose its pressure on the case. I welded a 3/8" thick block of steel inside the receiver in front of the ejection port with a notch on the right side for the cocking nose. This will raise up the case and put pressure on the plunger and the case will flick out of the ejection port. The recouperator will need to have a little side metal ground off to allow removel when needed.
The system works without a failure no mater how fast you shoot. The reason I went this route was that I built my own design on the back bolt and didn't want all the moving parts of the 42 ejection system. My FP is 6 3/8" long made from 1/4" drill rod cut down most of the way to 5/32". The hammer (AR-15 FCG) hits the 1/4" end on the FP. I had to play with FP return springs to control slam happiness, and use a wolff HD hammer spring to out smart the FP spring. I hope this gives a some what clear idea of what I did.
LOL
Weasel
i have a new idea for the firing pin!
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js412000
Weasel, Thanks for the description. I am not shure what the 3/8 metal block welded on is for. Is the ejector spring not strong enough to throw the case out on it's own?
On my gun , sometimes the ejector will tip the case down at an angle of about thirty degrees, but not throw it completely clear of the gun. When the bolt goes forward, the front of the empty case stubs out on the front of the ejection port opening, or jams up in some other way. If I change to a smaller booster nozzle, the bolt works with what seems like excessive force and ejects the empty case with extreme violence.
From your description it looks like your 3/8 block would bump the case back into the ejection port.
I also made the back end of my bolt carrier different from the brp design.
I might try a spring loaded ejector. It looks like there is room for a good size spring inside the bolt carrier, surrounding the firing pin spring. My M1a and ar15 both use super heavy springs on the ejector.
On my gun , sometimes the ejector will tip the case down at an angle of about thirty degrees, but not throw it completely clear of the gun. When the bolt goes forward, the front of the empty case stubs out on the front of the ejection port opening, or jams up in some other way. If I change to a smaller booster nozzle, the bolt works with what seems like excessive force and ejects the empty case with extreme violence.
From your description it looks like your 3/8 block would bump the case back into the ejection port.
I also made the back end of my bolt carrier different from the brp design.
I might try a spring loaded ejector. It looks like there is room for a good size spring inside the bolt carrier, surrounding the firing pin spring. My M1a and ar15 both use super heavy springs on the ejector.
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artech
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smoggle
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ratatatman
Ratat,
The bolt head seems to be hard at the surface??? I used carbide drill bits, but used a grinder to notch the surface flat (level) before the drilling.
I drilled through the wedge cam with a two flute carbide bit with no trouble.
To the question of the 3/8" welded in block in front of the ejection port:
This is to raise the shell casing up to load the ejector spring
right before the port. The case hangs down at an angle to
low to load the spring from the bottom of the receiver by
itself. The centerline of the bolt to bottom of receiver is 3/4".
The block of steel also stops the FA bolt and cocking arm from
going into battery, so it also works as a bolt block.
I also made a very heavy bolt which runs slower than a 42
bolt which was altered. This bolt was made from 4140 steel
rockwell 40-45. It is machineable. I also welded the trigger
group to the receiver which also blocks the FA bolt unless one
removes the hammer which would be dumb.
I hope this answers some of your questions.
Have fun,
Weasel
The bolt head seems to be hard at the surface??? I used carbide drill bits, but used a grinder to notch the surface flat (level) before the drilling.
I drilled through the wedge cam with a two flute carbide bit with no trouble.
To the question of the 3/8" welded in block in front of the ejection port:
This is to raise the shell casing up to load the ejector spring
right before the port. The case hangs down at an angle to
low to load the spring from the bottom of the receiver by
itself. The centerline of the bolt to bottom of receiver is 3/4".
The block of steel also stops the FA bolt and cocking arm from
going into battery, so it also works as a bolt block.
I also made a very heavy bolt which runs slower than a 42
bolt which was altered. This bolt was made from 4140 steel
rockwell 40-45. It is machineable. I also welded the trigger
group to the receiver which also blocks the FA bolt unless one
removes the hammer which would be dumb.
I hope this answers some of your questions.
Have fun,
Weasel
Angles??????????
What angles.
If you are looking for drawings, I did make full detail drawings when I built the bolt. I knew that I might need them one day. I will try and post them on the board. I will have to get the little woman to scan them so I can post. If anyone wants copies or a bolt made PM me.
Weasel
What angles.
If you are looking for drawings, I did make full detail drawings when I built the bolt. I knew that I might need them one day. I will try and post them on the board. I will have to get the little woman to scan them so I can post. If anyone wants copies or a bolt made PM me.
Weasel
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