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Replace the stock insert with a longer one that protrudes past the stock casing. A guy like Graycrait can help you make the selection. Several people can supply the insert, such as Firewalker or TorqueMaster. All it takes is driving out two pins, replacing the stock insert and putting the...

All barrels are not equal. Lothar Walther barrels have larger land and groove diameters than other airgun barrels. Some barrels are heavily choked and others not at all. So, Nervoustrigger's suggestion above, to wrap a slightly undersized rod with tape to create a custom fit in your barrel...

PM sent to LayeredOgre.

The flat recessed crown shown above does offer some protection to the bore edge from accidental bumps. Valuable, for unshrouded barrels that will be used without any form of protection, such as a moderator.

The deeper and more acute the crown angle, the more critical that the crown be coaxial with the barrel bore. Also the more obvious if the barrel bore is not concentric to the OD. Else, due to the low muzzle pressure of typical airguns crowns, anything from flat to 60 degree included angle...

I would expect more of a velocity increase, if the starting length was "short". Unless the plenum were very small, and the valve duration very short. Could be a ,mispositioned O-ring at the breech thimble, leaking air. Put the original short barrel back in to see if you got the original...

The new barrel may have higher bore friction. Shoot it some more and see if it improves. If your tune is mild the last few inches of barrel may not add much anyway. Especially if your reg pressure is high and the valve dwell very short. Then the average air pressure driving the pellet is...

After lapping the bore to be even, a choke at the muzzle is not as useful as with a barrel that has tight and loose spots down the bore. It is even possible to lap in a deliberate choke at the muzzle, or evenly from breech to muzzle. What you don't want is a breech end that is tighter than at...

Better for pellets, rather than slugs.

It looks like you will have to buy one to see the manufacturer's address on the box: https://www.airgunnation.com/threads/trident-moderator-by-ramus-technology.368072/ https://www.airgunsofarizona.com/ramus-technologies/ https://www.facebook.com/ramustech/...

PA seems to have it. Donny FL .NET seems to have it, while .COM states part is no longer made: https://www.pyramydair.com/product/donnyfl-hatsan-semi-auto-pcp-rifle-1-2-x-20-adapter?a=9827&srsltid=AfmBOoqE1lArxzrK8MjQV9qxEXJoyxNTKMKHXzmjGzuvGn4aEfEEpwtV...

Steve-l, There are many different 3D printing plastic materials, with varying properties. PLA has poor thermal creep resistance, despite being fairly strong and stiff at room temperature. Some printing plastics have carbon or glass fiber in them for good creep resistance. My designs...

Something that preferentially sanded down the lands, regardless of grit size. Would not happen with a "hard" lap cast of lead.

steve-l, You assume too much. I started making mods for my own airguns, based on the idea that the smaller the baffle bore clearance, the better. Since then, I have designed hundreds of custom mods for other people, included members of this forum. Some of those clipped, until I opened up the...

Blueduck, Barrel whip is a good way of thinking about it. Barrel bands should shorten the section of barrel that is free to whip; effectively stiffening the barrel near the muzzle. That said, the rest of the design matters, so some barrels can shoot better with bands added, while others may...