Hi there doc, I've been looking at turtle cockers for a while and just found your site for the fastback cocker and I love the way it looks, just 1 problem. Why would you have your bolt connect to an aluminum slide like it does, why not just make the vertical bolt pion go straight through to the hammer and eliminate that aluminum slide, making just the bolt move on the body, delrin on aluminum much smoother and hyou could probably find much higher rates of fire. Or if you need that aluminum slide, why not create it out of delrin to cutdown the weight.

Also, about your bolt, I love the way my current orracle bolt shoots, its open cup face unlike your small bore flat face, anyway you could change the bolt so its a bit more like the orracle bolt, if not as a change maybe for me? Hit me back im very interested but if im gonna get something so crazy I want it perfect for me, which im sure you understand.

Thanks, great work, and keep it up doc
Jay
NY

Why would you have your bolt connect to an aluminum slide like it does

-Because that's what moves everything. Something has to connect the pump rod to the bolt, and the bolt pin is what cocks the hammer.

why not just make the vertical bolt pion go straight through to the hammer and eliminate that aluminum slide

-The pin does go straight through to the hammer. If the slide were eliminated, what would connect the pump rod to the bolt?

delrin on aluminum much smoother and hyou could probably find much higher rates of fire. Or if you need that aluminum slide, why not create it out of delrin to cutdown the weight.

-I've thought about that, and may experiment with it in the future, but as it stands, a Delrin cocking block would save very little weight over an aluminum one. More importantly, I have questions about the long-term durability of a Delrin block, mainly where the pump rod threads in.

I would rather have the block an extra half-gram heavier if it means the block lasts twice as long before wear occurs.

Also, about your bolt, I love the way my current orracle bolt shoots, its open cup face unlike your small bore flat face, anyway you could change the bolt so its a bit more like the orracle bolt, if not as a change maybe for me?

-I'll be happy to make you whatever sort of bolt you'd like, whether cavernously large, venturi or whatever.

However, I've done some testing, and with a carefully tuned low pressure setup (about 200 to 220 psi, sprung for efficiency) the Fastback-spec bolt gives 30 to 45 FPS more than a very "open" bolt.

The open bolt you might think "flows" a lot, is really just open, empty space. The port coming up from the valve is considerably smaller than currently-popular bolts, and that additional space in the bolt does very little but provide room for the air burst to expand into.

If the air burst expands before it reaches the ball, some energy is lost, energy that is better used to actually get the ball moving. I did relatively extensive testing with the original Fastback prototype when it was in development, and it was quite consistent- a "fat" bolt, with a huge port, would regularly shoot upwards of 45 fps less than the smaller-port bolt.

Second, the "flat face" is intentional. A cupped face has no benefit that I've found, but allows the ball to roll backward in the breech, just a little. That allows the next ball in line to fall just slightly into the breecch, where the passing bolt strikes it on the edge, sometimes cracking it.

I've found this with high-tensioned HALOs and brittle paint, and less commonly even with normal shell paint.

The flat face limits how far the ball can roll rearward. This helps reduce or eliminate the "next ball" crack, as well as improving the reliability of through-breech ACE eyes since the ball can't roll "out of line" as easily.

I didn't just throw these together to sell on looks alone. When I designed them, I wanted the best I could make, in looks, quality of manufacture, and especially performance.

If it's worth my time, it's worth doing well.

Doc.

Thank you, and you've been very informative, great site, great work, keep it up