Recent content by subscriber

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...

Cost VS benefit remains a strong driving force; even if the same company makes all components in a given system. At least a single supplier can't blame the makers of other parts. The end user should concern themselves with the performance of the system, not prescribe how that is to be...

steve-l, Your rod method is great for verifying static alignment. When you actually shoot your airgun, additional clearance may be required to tolerate the fact that the barrel and moderator no longer form a straight line, due to barrel flex; or harmonics. if you prefer. Especially...

rootdude, Details would help: What caliber are you shooting, at what power? Are you using an optic, or the stock open sights? I might know of an option that you might care to try :)

A cast "hard" lap is the best way to relieve a tight spot in a barrel, because it preferentially cuts the tight spot. Rougher grit can be used with a hard lap, but a soft lap such as a tight patch will cut everywhere the lap moves, including where not required. Soft laps are OK for...

Aldhy, The easiest to fix would be if steel is raised into the barrel bore at the edge of the o-ring groove because it would be very little material to remove. Your comment about 8 to 7 cm at the breech being tight makes it sound more like a longer section of the bore has been reduced...

Aldhy, Did the gunsmith reduce the outside diameter of the breech end of the barrel? Did he do anything to create a chamber, or machine an o-ring groove? If the barrel had even friction before, then the breech end may have a section of reduced diameter, that sizes the pellet down so when it...

One thick walled expensive option: https://www.lothar-walther.com/smoothbore-blank-choked-.177-air-smoothbore-od-.63-l-23.82-precision-rifle-steel-tube/llgc-45-16-605 Lightweight cheaper options...

See what STO has to say about the Brevitas: "This design was intended to function on the end of an already shrouded gun and to blend in to the shroud profile for a unmoderated look and feel. Without effective reflex volume, this design simply lacks the internal volume to produce optimal...

Heavy cuts, and or a dull cutter or reamer; either or both a very shallow angle.

Ugly. More ugly as a muzzle end than a breech end, due to the very shallow angle at which the lands were graunched (chewed) at. Then there are multiple detail cuts that should be sensible and seamless, rather than pointless and stepped. The red line also points at a huge burr, that repeats...

Thanks, Boss429, I am not a sound engineer. Just a mechanical engineer with an interest in designing and testing airgun mods.

graycrait, Unfortunately not everyone has the opportunity to try several mods, and choose what works best for them. They are left with buying mods based on forum reputation, or using published dB values. As you mentioned size of the mod, that could certainly be as large a factor in a purchase...

I like to loop drum solos when I shoot, so anyone that walks by locks onto a repetitive slapping sound to figure it out, has an easy answer to, "what was that".

kwaping, I am a retired mechanical engineer, that designs airgun mods for fun.