Sterling Concept Marker

[Lane]

Been messing around a little with the sterling design in CAD to add some additional features and see what could be done if it was started from more or less a blank slate. I'm working around the concept of an extruded aluminum body to reduce the machining and will be looking at a molded frame and pump. A couple of the features I'm working to add in are listed below. The images are the initial body concept with the valve and bolt, still need to work out the hammer and pump components. For a size reference, the body is 5" in length. Thoughts or suggestions?

- Autococker threads
- Air through grip
- Detent
- Under-cocking pump
- Easier method to adjust velocity, considering something along the methods of Tippmann markers where they restrict the airflow from the valve to the bore
- Interchangeable feed (hopper or horizontal tube)

[RuleOfSines]

If you haven't seen the Avratech Falcon before, I have a bunch of pics of one that may provide some thought:
Avratech AV-1 Falcon - Peculiar Paintball

It too is of Sterling influences.

[Grendel]

I so had such hopes for the Falcon such a nice concept.

[Lane]

Familiar with it, I was around on MCB during that time of the Falcon and Retro. I've actually been looking at your site quite a bit while working on this. By the way, great work on the site RuleOfSines.

[808raoul]

I have a Falcon, I really love the gun. It barely works at the moment, the sear has a hard time catching. Maybe one day soon I'll look into figuring out how to improve it.

[RuleOfSines]

Been messing around a little with the sterling design in CAD to add some additional features and see what could be done if it was started from more or less a blank slate. I'm working around the concept of an extruded aluminum body to reduce the machining and will be looking at a molded frame and pump. A couple of the features I'm working to add in are listed below. The images are the initial body concept with the valve and bolt, still need to work out the hammer and pump components. For a size reference, the body is 5" in length. Thoughts or suggestions?

- Autococker threads
- Air through grip
- Detent
- Under-cocking pump
- Easier method to adjust velocity, considering something along the methods of Tippmann markers where they restrict the airflow from the valve to the bore
- Interchangeable feed (hopper or horizontal tube)

One thought I had is while adjusting velocity through the bolt is simpler, being able to adjust the valve does make it easier to tune for CO2 vs HPA.

[Lane]

Agreed, was considering using different main springs or having the option to shim the spring may be good for larger adjustments while using the velocity adjuster in the bolt to fine tune in the FPS.

[XEMON]

One thought I had is while adjusting velocity through the bolt is simpler, being able to adjust the valve does make it easier to tune for CO2 vs HPA.

And make it more efficient for 12g use ...
The more adjustment the better 👍

Are you planning on having a reg somewhere?

I like the valve opening from the back, could be a nice and easy way to add or remove insert for volume control.

[Lane]

No plan on a reg at the moment since I'm trying to keep the part count down.

[jetenginekyle]

Barrel threads look pretty thin, I bet that as it is now they would be prone to failing when core sampled.

[Frmrspec]

that’s almost 100% what I did.


https://www.mcarterbrown.com/forum/custom/custom-projects-custom-questions/528514-too-poor-for-a-j12-enter-j12……ish

[Lane]

Reading through your post again there's definitely some similarities. You're idea with the back of the valve being ASA threaded is neat. I've got the back valve threads at 7/8-14 so slightly larger.