I have 5
FX guns , A Wildcat MK1 with the first concept of "smooth bore" , which means a heavy barrel , 16mm od , totaly smooth until the last 10 inches at the muzzle . Never had POI shifting issues , same with the Boss . Not the same with the Crown or the Dreamline. Maverick doesn't show a lot of POI problems , probably because the barrel assembly is kept in place in a stiffer way.
I've never put a lot of trust in the "liner in a tube in a shroud ", even in the Superlight system. Last week I put a Superlight barrel .30 on my Crown , and I had the feeling that the spacer , mainly the one near the muzzle , had not a tight fit with the shroud , so I modified the system . I machined a steel tube to go around the last inch of the liner with tight fit , and to go into the end cap of the shroud , also with tight fit and epoxied . So now the end of the liner is kept in place with the shroud in a very solid way . The first groups were very good .
The drawback of this setup : air from the liner cannot enter and expand into the shroud , so the gun is louder than before.
This is maybe not THE solution to decrease POI shifting problems , I just wanted to try something
.
Oh yes , I get also 4 Kalibrguns ........POI shifting problems ??? What are talking about ?
See drawing below .
View attachment 428890