Maximus Prime

[Buldawg76]

That's going to look really good with a full shroud on the barrel and a trigger guard in place. Almost like a baby Mrod and looking forward to the shot strings after its tuned and the accuracy with the shorter barrel.

Mike

[FuzzyGrub]

Almost like a baby Mrod

That is the goal.      Well, maybe a young adult, late teen, etc.  All the spunk, just not the weight. 

Shot count target is 30 at 30FPE.  Anything more is gravy. 

David said the shroud is done already! wow..  LW hammers are next,  The reg will take a week or two. 

I have the valve back out and doing more work.  Exhaust is now 0.160" and will take the pocket a little further, then clean it up. 

I might put on my 20" LW barrel, and if so, need to modify the shroud mounts for the larger OD.

and still have to do some trigger adjusting. 

But, the hard stuff / unknowns are over.   

[Buldawg76]

Yes I would go with the LW barrel on it. I have a LW 20 inch barrel from a Daisy Avanti that will be used on a disco tube gun I have for a project in the works.

You can buy the LW barrels for the Avanti from daisy for 65 bucks that include the valve body and barrel. Then press the barrel out of the valve body and cut the spigot off the breech end and drill for TP port and rework the leade and makes a cheap LW barrel for use in a crosman.

Mike

[FuzzyGrub]

WARNING!  This thread shows modifications done to the air tube.   These modifications may have extreme safety consequences.   No analysis or testing has been done to verify any safety margins.  Any modifications done are at the risk of those performing them.   

[FuzzyGrub]

Valve exhaust is now 0.160" and pocket is 0.230" and TP 0.160".  Assembled with the 20" LW barrel and test string was throwing JSB 18.1g over 870 fps with minimum hammer, to bellow 1.3Kpsi. 

[Buldawg76]

How many shots at that power level are you getting out of it now. What is the fill pressure you start it at. Looks like its a powerhouse for sure.

Mike

[FuzzyGrub]

How many shots at that power level are you getting out of it now. What is the fill pressure you start it at. Looks like its a powerhouse for sure.

Mike

I have a leak at the gauge block, so starting pressure was down to 2.6K.  I shot 3 mags, 24 shots.  Peaked around 920fps. 

Really was just testing that the porting was plenty for the lower pressure that the reg will be set to.  Just have to see if I'll have enough plenum. 

[Buldawg76]

How many shots at that power level are you getting out of it now. What is the fill pressure you start it at. Looks like its a powerhouse for sure.

Mike

I have a leak at the gauge block, so starting pressure was down to 2.6K.  I shot 3 mags, 24 shots.  Peaked around 920fps. 

Really was just testing that the porting was plenty for the lower pressure that the reg will be set to.  Just have to see if I'll have enough plenum.

That's not bad from 2600 to 1300 psi for 24 shots above 30 fpe. It shaping up to be a good light gun making very good power with fairly easy mods.

Mike

[FamilyMan811]

Keep us posted on that block ... I have a leak there too.. at least I think.
It passed the 10 for 10 at PA they said it didn't leak anyway came bout 1000 psi

I have had it apart 3 times now .. new O rings throughout, checked poppet..even tried a new spare block and it's still leaking ever so slowly.   

Fill nipple?

[FuzzyGrub]

I have verified mine was leaking at the gauge port with soap suds.   The prod gauge block rotated in the tube pushing it down with dowel rod.  I imagine I sliced an o-ring rotating it at the hole. 

[FamilyMan811]

About forgive my ignorance...soap suds?
Like just get some dish suds all around it?
I was so desperate to solve it I debated submerging lol

[FuzzyGrub]

About forgive my ignorance...soap suds?
Like just get some dish suds all around it?
I was so desperate to solve it I debated submerging lol

No, one of those hand soap dispensers, that when you pump it, produces a foam.  I just cover the area around the gauge hole and watch.

[Buldawg76]

I have a tool I got from the vendor we cannot mention here that fits on the tube that has a protrusion on it to fill the hole in the tube so the o ring does not push up as it passes over the hole in the tube for Mrods that works very well. I do not think they make one for the Disco, Maximus or Prods but I use my thumb lubed up with silicone grease pressed hard into the hole as I push the block in to do basically the same thing preventing the o ring from being cut on the hole.

I have also used a hole deburring tool to remove any sharp edges in the inner lip of the tubes as well. It can be frustrating to keep having a leak at the gauge block from cut o rings as I had my share till I bought the tool for the Mrod and learned to use my thumb on the others.

Mike

[FuzzyGrub]

That is the most common way to nick the o-ring.  I know of the tool you are speaking about.  I just use the side flat blade screw driver to press down on the o-ring. 

In this case, I rotated the gauge block while the 1st o-ring was across the hole.  I shouldn't have done that.   

[FuzzyGrub]

Replaced the gauge block O-rings and seems to be holding steady.   

Installed the TSS, and ran a string with no preload.  I was not expecting a low Es string, since I went to a light poppet for the reg/LW hammer that is coming, but thought I'd try it anyway.  3K to 1.4K, 864-946-866 for 27 shots with JSB 18.1g pellets.  From 2.6K to 1.6K, 911-946-909 for 18 shots.  The center 10 shots were 943-946-942. 

[39M]

Does anybody know if there is enough clearance to mount the Marauder shroud on the Discovery using the factory steel breech without a riser?
Obviously the barrel would have to be shortened, and possibly the air tube, along with some sort of custom barrel band.

[FuzzyGrub]

Does anybody know if there is enough clearance to mount the Marauder shroud on the Discovery using the factory steel breech without a riser?
Obviously the barrel would have to be shortened, and possibly the air tube, along with some sort of custom barrel band.

Neither the Mrod shroud or the smaller diameter Prod shroud will fit a steel breech without a riser. 

[39M]

Does anybody know if there is enough clearance to mount the Marauder shroud on the Discovery using the factory steel breech without a riser?
Obviously the barrel would have to be shortened, and possibly the air tube, along with some sort of custom barrel band.

Neither the Mrod shroud or the smaller diameter Prod shroud will fit a steel breech without a riser.

OK. Thanks.
I've been watching your build, and parts buying list.

I like the idea of building what you want in a rifle, and although I have not yet owned a PCP I want a lot of the same things. But I figure I could suffer through single loading for a while until I just had to have something better.

I was actually thinking the shroud flush on top of the air tube with a custom barrel band would be the way I wanted to go.

[FuzzyGrub]

I was actually thinking the shroud flush on top of the air tube with a custom barrel band would be the way I wanted to go.

The shroud would be above your dovetail, need custom fittings, custom off-set baffles that don't rotate, and will have poi issues with riding along the length of airtube. 

[39M]

I see.
So it is larger diameter than the steel breech.

I'll have to ponder that a while...